Ninja Gaiden 2 paralax scrolling causes the mapping to freak out

[wertercatt]

I just walked left and right in the first level and this happened. The game is scrolling left and right, not diagonally.
(rom is a Spider-Man themed hack of Ninja Gaiden 2, but this should occur in the real game too.)

[wertercatt]

The mapping in NG2 is messed up more than this if you keep playing, this is just immediately noticeable.

[thatsprettygood]

f to this project