Key Interpolation issue

I’m experiencing an issue with key interpolation. For some reason it doesn’t become a bezier curve. It is jittering and it’s seem like stairs in “sequencer curves”. Can anyone help me ?

Well, If someone struggling with this problem too, i found the answer. So, the problem was in world position pivot point ( something like that xD ). I placed the objects too far from the initial point of the world, and for some reason this bug appeared. I redused the planet size ( you may see it on picture ) and move my object closer to the initial point of the world and the problem disappeared. BTW it still has suuuper small shaking ( which i cant see on graph but i see it when camera moves ) but if i would move it even more closer i think it would absolutely disappear.