I am here for a fight! No such thing ever as BAD PC! Put up yer dukes!
Okay but seriously though... You could have gotten something in your powder to contaminate it. maybe some humidity level went way high, who knows. Could be a bad batch. Things happen and not everything in this world is perfect... My recco would be to contact Randy and work something out or try another batch of PC. I think I only bought the CLEAR PC from Smoke so that I could mix my GITD in it and make ghost bullets... Worked excellent.
For everything else though, I have powder that I have gotten from all over and I know what works on my list.