framerate/dt problem

[utunnels]

Back to topic, I think it has something to do with float calculation (like 100.00000000001 vs 99.99999999999).

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if self.py == math.floor(self.y) and self.px == math.floor(self.x) then

Although you do this check here, but maybe math.round is better?
Or perhaps you should avoid using dt as a parameter, use loop count instead. That is add up dt and when it reach a certain amount, update your scene and increase loop count.