Breeding Cave

I recently purchased 2 male and 2 female BN. 1 male is much more developed then the other, but they are still both of breeding age. I have already had a spawn of fry, that would have been about 2 - 3 weeks ago. The fry are now freely swimming around the tank but the father won't emerge from the cave EVER. The 2 females and the other male swim around the tank but I never see the other male. Does anyone have any ideas as to why he's not leaving the cave? He's not looking after the fry anymore as they're everywhere, nor is he protecting eggs.

I'm new to all this but my understanding was that the male would leave their cave occasionally but this thing is basically glued in there. Amidst all this, the other male I have doesn't seem to have a cave at all, he just goes everywhere. Very strange.

Thanks in advance for any help provided.

He will be leaving the cave on a night when lights are out to feed he will be fine, try feeding and turning lights out and sit and watch the tank i bet he will be out with in 15 minutes

my male L182 does this and he is fine