Hi Dudu @duduedri96 ,
That appears to be a lighting artifact caused by the new EEVEE. Compare 4.1 and 4.2:

So you can either use 4.1, or switch to Cycles.
Maybe there is a Setting somewhere in EEVEE, that you can tweak to make this better, but I haven’t found it yet. It is also very possible, that it’s a bug (4.2 is new and EEVEE is completely re-written, so that’s not unlikely).