In an MP level I'm working on, I have a fair number of powerups scattered throughout the level. When testing, only about half of them visually appear, but if I walk over the spot where the rest are supposed to be, the powerup gets added to inventory but no sounds play or anything. After about ten minutes in the game I noticed that some actually started to appear where they were supposed to. I never got to the point where all actually appeared. I only did a novis-nolight compilation if that helps. Any idea what could be causing the problem though?