Hello Giles,
I took a look into the issue, and I have an explanation as to why you were still seeing the old value.
I retrieved all the ad parameters from your AdGroup using the API. I've listed them here. Only one keyword has the new value that you requested. All the other parameters still have the old value. Some of the other keywords that you have listed here that are still showing CHF32 are phrases that are a subset of the one I highlighted. For example, one of the other parameters points to a keyword phrase that is similar to some phrase, while the one I highlighted is similar to some phrase tickets. The parameter that was being activated when you searched was the some phrase parameter, which is why CHF32 was being displayed.
NOTE: I'm not actually mentioning the actual keywords in your campaign because I would like to keep that private.
<criterionId>294569646</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex> => Keyword: some phrase
<criterionId>10626951343</criterionId><insertionText>CHF38</insertionText><paramIndex>1</paramIndex> => Keyword: some phrase tickets
<criterionId>11446567797</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>12421629255</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>12421897725</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>37563996162</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>37563996282</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>39782199662</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>39782200502</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51272735633</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699631770</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699649650</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699657090</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699739530</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699741090</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699741450</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699742290</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699742890</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699746130</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699757050</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>51699760890</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>52934579993</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>52934581313</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>52934581433</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572380222</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572381302</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572382742</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572383822</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572395702</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572396542</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572396662</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572397022</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572397502</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572399902</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572400142</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572400382</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572400502</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572400622</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572400862</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572400982</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572401102</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572401342</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572401582</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572402182</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572402302</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572402662</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572403022</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572403142</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572404222</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572404462</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572405662</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572405902</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572406142</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572407942</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572408182</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572408422</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572408662</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572587462</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572588902</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572589262</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572590102</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572590222</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572591302</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572591422</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572591542</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572591902</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572592022</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572592142</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>57572592382</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>59808322391</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>86260245506</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>86260245746</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>86260245986</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>86260246106</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>86260246466</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>93433141986</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>93433142226</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>106405572735</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>106405577055</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>106405604895</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>117761818873</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>117761820073</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>117761822473</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
<criterionId>117761823913</criterionId><insertionText>CHF32</insertionText><paramIndex>1</paramIndex>
Once you make all the parameters have the same insertionText, your issue should disappear.
Best wishes,
Nadine, AdWords API Team