Walls are "flashing"

[Codex]

Ferryadams is correct, although not the nicest way to put it. Basically, your walls are overlapping. Your floors are as well, so the game/editor makes it flicker because it can't determine which to display, so it displays them both. Simply move each object that is causing the flickering back by .001 or so, and it should stop.

Thank you Anxt and Ferry
I really appreciate it.