My apologies if I did not understand the issue right away. The PostClickQualityScore, CreativeQualityScore and SearchPredictedCtr values are not determined by the value in the QualityScore field. The
QualityScore field pertains to score of the AdGroupCriterion (Keyword), while the
PostClickQualityScore is determined based on the landing page, the
CreativeQualityScore is based on the Ad and
SearchPredictedCtr is based on clickthrough rate compared to other advertisers.