I agree, but not seeing it I'm guessing that somebody is not happy with there new mate in there. Every thing all lined up? Clip's ok? That got me once. But it sounds like you're knowing your sheet.
I had a flash caromed cylinder that bit me in the ASS several times!,,,
Turned out...... it was a peice of junk Floating around in the bottom end that was just trying to get out! Very $ lesson I learned....maybe this will help.