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I have this is all games. I think... When cycles are to high the games act weird..

Maybe I should change something in confing? Is fullscreen resolution 1024x768 good?

From confing:
# cycles -- Amount of instructions dosbox tries to emulate each millisecond.
#Setting this higher than your machine can handle is bad!

Maybe 7k is too high for my machine?
Try to set very very high cycles when u play and see what happens? Maybe u will have the same effect?