OK, here are the specifics since we seem to have interest. I apparently misremembered the details, but this example is every bit as scary.
Below is the "before" picture, the default pretender god I created for this MP game for this early-age Mictlan nation. The magics might have even been higher if I had done any empowerment, but not by much. The Pretender is one from my Mytheology mod; it has Recuperation (but not immortality). The regeneration is just from the Nature magic. Note, the exact same problem happened in another MP game, where one of the other players with the default Dagon pretender went from many-to-none, so it's not due to my mod.