Originally posted by orus
No, one character went well into the 20s and the other is at 18, and those 3 are the only crystals i've ever gotten from random loot.
Well that is strange, but I would have to say it is back luck, since it uses the random loot system. It can't be a bug since it hasn't happened to anyone else...
EDIT: make sure you loot every possible place if you want USM crystals since they are hard to find, that is my best advice for finding new crystals.