i think i just did something really dumb
So I just finished cleaning some 40 brass using dillion rapid polish in tumbler.
I threw it in the tumbler and started pullin my dillion. I had some older brass in the case feeder but threw the newly shiny brass on top. After about the 60 load i(checking) every tenth on the powder scale I noticed the one I was weighing had some gunky media in the bottom that was a little moist. I then started weighing each load and started seeing other cases with a little gunk in them.