Last weekend hunting in Ks I had some poofs and a delayed ignition with some brass magtech 28 ga loads and also some in plastic hulls. I have never had a problem before. The shells sat in the truck overnight and there was a lot of moisture in the air. The brass hulls were loaded two years ago and have sat in my load room. The were glued on top with duco cement. I have not taken any apart yet. The powder was Goex FFF. Any ideas on what could have caused this would be appreciated.