Blender Addon - Blenderer

Hello, could someone possibly help me? I use blender mainly for pictures, but I don’t understand that they are sometimes so overlit and sometimes perfect in quality only if I change the view a little.
Especially the floor bothers me that it is not rendered in detail.
Here is an example where the same settings were used.
Mainly i get the bad ones thats so frustrating.

Good Example:

Bad Example:

Thank you very much

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