i was playing on chapel,
i put down the sentry on the right side of the last objective to prevent last minute push (my team are all low levels so i take precautions)
i saw lock on exp on the screen but it didnt shoot the enemy that was delivering the objective
when i got there i saw the sentry turret is turned with the gun facing to the wall and is like having a hard time trying to turn from the wall
this has happened to me on every map but i still dont know what caused it
did you guys have any experience like this too? note that this happen after a lock on EXP but its not firing