I had a similar problem way back in the old days (about 1995) while shooting the SOF match in Las Vegas.
Benelli M1S90 ran perfect in practice, using full power buckshot, right up until the first shotgun stage of the match. First and every shot after the beep, the hammer followed the bolt down on a live round.
Rack the bolt to eject the live round, release a round, rack it to chamber the round, pull trigger, repeat...not quite the recipe for speed.
Turned out the 'big match" nerves had me holding the shotgun solid with a BGDG.
(Big Guy Death Grip.)
No movement under recoil = no cycling...I learned fast to relax my grip.
Maybe you had a death grip on it?