This is happening in Gemini Man's stage in Mega Man 3:
http://i.imgur.com/HXm9dz1.png
The top of the ground follows Mega Man around. I checked the rom in a different emulator and it didn't have that problem.
This is an emulation bug so i will let it that way for the moment :)
It occurs later on, in Wily 3:
http://i.imgur.com/v6rtvvO.png
