Noen som vet hva den tekniske årsaken her er? Filer med underscore burde vel funke fint?

It's been bothering me for a while, we've had some drywall anchors in the wall that was used by the previous owners.

There was also some general scuff marks and stuff

So I removed the anchors, patched the drywall, sanded it, patched it again, sanded again, cleaned and painted

Now it looks like they were never there