(There'll probably be a proper highlight of this later) I don't know if this has been observed as extreme as this - I had not seen this before. Not sure if it could be utilized for speed somehow. The first guess is that lag may play a role here.

4-1 its a really bugged stage but i dont know why that happens we have seen that on different forms like some cannon dissapear and just today saw it on 4-2 practicing hard mode

I have encountered this many times before to a lesser degree whilst routing. JesesFTB explained it me, but I cant remember exactly what causes this anymore. It was something to do with the longer you spend on moving platforms, the further ahead it pushed objects on the screen, or vice-versa.