strange shadows

Hello community,

my problem is:

I set the lightmass resolution of my static mesh to a ridiculous high value of 2048!

I set the build light quality to high!

I set up the UVMap and the Lightmap in a proper way

BUT:

however I receive some very strange shadows as you can see on the picture I provided!

pls help me to get this issue fixed! THANKS A LOT in advance! :smiley: