I've noticed similar problem's with Press association's data at least, with series Like Horizon & Storyville, that it often append's the series's overall title into the episode title as well, so you can get the frankly ridiculous (If you have the series title first as well):
"Horizon: Horizon: 40 Years on the Moon - Horizon"
As can be seen from that example, they also append the series title as a suffix too on occasion. I presume the data from
bbc.co.uk doesn't have this problem, but its an annoying quirk with PA's data at least.