Could you post a download link to your .blend file so I can take a closer look? Best way to do this is by uploading to dropbox, google drive, or equivalent file hosting service and copy + pasting a link here.
Oh i just found out that the problem was that i forgot to add (to the UV collection) and scale a wooden plank, and also to pack every object in the UV Map. But Thanks a lot! I’m loving the course!