I caused a bug in the 1.6 public version. After quitting and restarting the bug has since fixed itself.
The bug itself: I was able to recycle enchantment fodder. As in no ratgirls were consumed while enchanting and all of them could be reused to upgrade every other ratgirl of the same rank until there was only 3 left. Then you'd have lots of rank 2s that could be recycled to make rank 3 giving you more to convert into rank 4, etc.
I caused this by going through a dungeon and deciding I'd catch as many as I could before leaving. Left it with a conga line of 40+ ratgirls (2 high level woolmages and a soldier are really good for capturing enemies). Enchanted as soon as it was over. My guess is the bug is caused because I had an over abundance of ratgirls to enchant, mass enchantment back to back to back screwed something up, or I had so many that names repeated and somehow I enchanted an Abigail with another Abigail. I can also see enchanting 1 character using 2 with the same name being a problem.
The bug let me get all my important/domesticated ratgirls to rank 5. Feels too powerful for anyone else who can replicate it. So thought it was worth mentioning so it can be looked into.
other possibly relevant info: My roster leaving the dungeon was 111, and I could not do this with ramgirls. I'm not certain if it's because by the time I tried enchanting them the bug retroactively fixed itself (seems like battling resets things) or it was only effecting rats at the time.