Black squares on a lightmap

After baking light with this curtains the wall and the window starts to look disgusting. Whith out curtains it looks absolutely fine. What can this be?

Try unwrapping the UV, and settting the Lightmap Padding to 50.

I’m not sure if this is specific to URP but I’ve been doing a lot of baked lightning lately and this is a video I used and it cleared up a lot.