Weird shadows on table mesh

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As you can see, there are weird shadows on the corners of the table. What can I do?

Update: I fixed the problem by moving the table in another place, however i still don’t know why this problem existed in the first place

The screenshot did not display, only an alt text tag. What are the lighting methods? static / stationary / movable, or a mix? What are the directional and skylight settings?