From what I can tell, the initial merger merged Kase-san to... into Yamada to Kase-san, whereas the separation renamed that into Kst.... while a new entry was made for YtKs, hence why your subs may be a bit messed up.
Yes. I was part of this and actually got together what was supposed to be where and put it into a format where a mod could actually run a script and move Yam. to Kase chapters from the "One Big Fucked-up Merge" into the way it should be (like it is now). There is a way to merge the comments to the new entry, which was good, but unfortunately, the way the back-end is coded, there's no non-pain-in-the-ass way to asign the followers to the new title, unfortunately (it would have to have been done manually, etc and was a bigger pain-in-the-ass).... So we did the best we could...
;_;
Edit: come to think of it, what we SHOULD have done was move the Kase-san to... chapters into a new title and just renamed the title and fixed the chapter numbers/volumes so that the followers wouldn't have been lost... I wish we would've thought of that before we fixed it. FML...
