only really looked how these catches work today did not know they had an open and closed position
it takes a fair amount of force on the lock finger to reset it in the open position. the only things I can see that would affect it are
1 damage to the stainless door where the lock engages allowing the finger to slip over the steel
2 door too low or top bowed up
have taken a pic of one I have here with a tape measure in so you can see if yours is the same
dave