Yeah, the problem was, in fact, with hitboxes, they were a little different since I've imported them instead of making points myself. Not sure why the game created this weird effect of screenshake though, but thx for the advice.
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So, in my game there's a concept similar to browser T-Rex, but the charachter is trapped in a box in the left about 40% of the screen, so he can't get to the right side. But it's made likely poorly, with just a box of invisible textures that have property "solid object", which works fine except for the part where charachter creates a little disturbance on colliding with those walls, kind of like a screen shake, which I would like not to happen. Is there any way to avoid this?