runtime graphical corruption.

So, I've been making this game. There are currently around 9 frames to the game, and I suddenly noticed some very weird stuff happening when I tried to play it from the beginning to the end. Somewhere around level 5 the graphics glitched fiercely, and the glitching lasted until I closed the game and started a new one.

It seems that the glitch randomly mixes up the frames of counters, actives, active pictures and backdrop objects. Also separate animation frames became frames from other objects.

I think I saw similar graphical glitching in New Satan Sam, but I've got no idea what causes it. I added a quickkey to jump from level to other instantly, but that way the glitch didn't occur. It seems to occur only when I've completed certain amount of levels the 'proper' way, which makes no sense to me.

Here's the glitched frame:
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And here's the normal frame:
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I guess it's quite much impossible to help since you can't see the code, and the bug apparently is caused by MMF 2 itself, but I'd love to hear if others have encountered something similar!

After trying stuff, it seems that the glitch is related to the active picture objects I'm using. The game takes 3 screen captures in fast succession with the screen capture object, and then loads the captured screens to the active picture objects. In certain levels, if I perfom this screen capture action and move to the next level, the graphics will glitch out. Nothing else makes the glitch to appear.