I had a shifter a while back that had its forms all jacked up, where I could not shift into them for some reason, stating that I didn't know that form. This was after many of them were already to Confidant. I was pulled into the ROTD, where the imm removed all of my forms, and reassigned them and their skill lvl.

When they were done, they said this bug might affect future forms (at the time I was 2nd tier in both shapefocuses). But they couldn't do anything about it as they were not assigned yet and they didn't know the level they at which I would receive them.

Maybe this needs some Imm confirmation, but the RNG assignment of form comes as the system rolls to see if you get a form at that level. (I.e. you level to 14, you have a 35% chance to gain a form, If you succeed it rolls to assign a form. If you fail, rank to 15, you have a 65% chance to obtain a form, it then rolls to assign form, so on and so forth.) Thats my rudimentary understanding.