Why does the surface shake when the character moves?

Development Character & Animation
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1

Hello! Why does the surface shake when the character moves? Look at video
with my problem: Why does the surface shake when the character moves? - YouTube

2

I see that objects flickering when a camera moves. Look at the cubes in this video Objects flickering when the camera moves - YouTube. The cubes shaking when the camera moves.

3

What is the scale of the surface

4

100% scale