ugly furniture shading

Hello. Can someone help me with one problem.. I have already tried different versions of the normal map and specular map, including empty ones. But I still really dislike those black spots on my desk. And it sort of rounds the corners, although the original table in the package file is flat and angular, and my table in blender is the same. How to make it look normal?

Images: drive.google.com/drive/folders/1aolUpGEie2OuPiOn1CX88ccCivH88OVd?usp=sharing