Yeah, I'm working on another Sonic conversion, and this one has a strange background:

It does not scroll at ALL vertically, but only horizontally. Problem is that in JCS, it shows up fine. In-game, however, there's a small area at the top where there's nothing (leaving layer 8 blank causes the 'multi-images' problem). Attached are a couple of screenshots (one from JCS, and one from the game at the same resolution).



Obviously the second one's from the game.

Anyway, how do I fix this?