Ok, I found the problem which is actually not a problem! Even though I usually don't see the dollar symbol before the names of the characters when I add them to RPGM, apparently sometimes I have to manually add it, so I did it and it's working! They look lovely, and they are really a lot!
I'll ask you here another question, so you don't have to jump through many pages: how long do you think it will take for the new faces to be added to the other pack?