why does my ipad not sort series properly

I have several tv series on my ipad mini running ios 7.1.2 and itunes is on windows 8, now my ipad has started to sort the seasons so that a few episodes are under 1 season tab and the rest of the season is under another which is very annoying as for example it shows me having 2 tabs for the 1st season of something. I have tried using itunes to change it but cant see how too and I deleted and re-downloaded all the series I'm having problems with but nothing has worked, please help me sort this