Thats interesting.
There has to be an explanation 🙂 … but difficult to know. It could be that the nest underneath the leave is not the very best and secure nest for the male, and some fry ‘escaped’ or got lost outside his nest, and then was picked up by the female and placed in a ‘better’ cave.
Or it could be that the male has actually used this bamboo and placed eggs there, but regretted and moved to another cave, – leaving few eggs to hatch.
But its really interesting that it seems to be the female caring for the eggs or larvaes. I have experienced it though, and I think others have as well, but its not very often.
And congratulations – then you have more little quindecims again ..