I am having issues combining pdfs on certain computers due to acrobat saying they are XML forms (see image) yet when I try a different computer it doesn't throw any error and is able to combine the files into one easily. Is there a setting that needs to be on or off am not seeing? Is there a way to tell if they really are XML forms? They don't carry any fillable fields. I don't want it to be a "portfolio". Just simiply need a single pdf. Any help is appreciated.
Things I've tried:
Restarting, Reinstalling, and deleteing everything adobe and then reinstalling
complete wipe of said computer and really starting fresh
That's what I don't understand. I spent half a day checking that everything between the computers were the same and they were. The other computer wasn't making a portfolio, I checked. It was combining them normally into a pdf. I also checked that they were pdfs and all the properties say they were. I understand that XML forms can't be merged that is not what am trying to do. I am simply trying to find why one computer says a file is a okay to combine and the other computer is reporting those same files as XML when trying to combine them.