Collision errors while changing screen

[blue626]

If you create a wall that's less than 3 blocks from the top/bottom of the screen, when you move to that screen, a collision error occurs (Viridian flips automatically after he touches the wall and the room and the room before show, alternating between the two). You can still move/flip Viridian to stop the glitch.
I wrote this so that level creators prevent from creating this glitch.

[Pyrite]

...What? Screenshots? I tried this to see what happens (don't know why) and nothing happens...

[blue626]

I meant that if Viridian enters the room right above the wall (below if it's less than 3 blocks from the bottom of the screen), the collision error happens.
I can't post a screenshot right now, but it happens on these levels: VR Training (Room: Pick-A-Boo) and Dimension WWWWWW (One of the rooms immediately at the left of the ship).