Scratch

I made a pretty large game file, and I've been noticing some inconsistencies while playing the game. I have quite a few sprites that "show" and then I set them to ghost effect 99 so that the player can click on a part of the screen and something happens, but the sprite cannot be seen. Sometimes, a sprite does not show up when it is supposed to (after it receives a broadcast signal). I had this happen with 3 pretty much identical sprites (they just go to a different x,y) that work almost every time. One of the sprites did not show when it was supposed to, but the others worked perfectly. When I manually showed it and clicked on it, everything worked as it should. I've had this happen to a couple other sprites, too. The only thing I can think of is that the sprite for some reason did not receive the broadcast signal even though the others did. I'm pretty sure it isn't my code, because the only part that occasionally does not' work is "when receive broadcast signal, show, set ghost effect to 99"

Anyone else have this problem at times?