My iPad is merging different TV shows with the same artist-tag

So I have 2 Animes which are produced by the same animation-studio. I use the artist-tag for the studio names and have everything perfectly tagged. Now when I tried to sync 2 TV shows from the same studio, one didn't show up on the iPad (after successful syncing). When I investigated further I found the missing TV show inside the the other shows episode list.

On iTunes everything works just fine.

The issue is 'fixed' by changing one shows artist-tag slightly but I'm not happy with it.

Can anyone confirm this or knows a fix for it without changing the artist tag? Is it a bug? I am using an iPad 3 with iOS 6.0.1 and iTunes 11.0.1.

In iTunes mark all episodes of a show, right click, information and change the artist name in the form. It's enough to add a "." or whatever to it. Now resync your iPad.