Shot a box of CCI brass today with not issues at all. Shot one magazine of WWB JHP and had one FTF. I then shot Two magazines of UMC and had one FTF. Any ideas why my gun did this. I even pulled the trigger multiple times on the WWB and UMC and they would not go off. I was able to reload the UMC and then it went off, but the WWB would not go regardless of what I did.