When you import a GEDCOM file to Gramps, Gramps should create notes in the tree with importing errors, in my case (not from PAF but another old software) it was the program that used things that is non standard to the GEDCOM format.
Some things in another field in another program might also end up under attributes in Gramps if its a non standard GEDCOM field, it depens how the program handles export of those things.
This might be a case of PAF exporting things to GEDCOM that is not actually a part of the GEDCOM standard.