Are you sure it was the gun and not the ammo? Too deeply seated primers are common with factory ammo, and can cause this. A crushed rim on a round can allow the shell to "seat" deeper in the chamber than normal and will also cause this. The fact that the same shell did not fire with both barrels lends toward those possibilities.

When you got it to fire normally back at the clubhouse was it with a different shell?

SRH

May God bless America and those who defend her.