One day last week I pulled a nuc from each of two hives. The frame with the queen, an open brood frame, a capped brood frame, and two pollen/honey frames. Today I checked them for queen cells, as they should have made new queens from the eggs I left. One was as it should be, with capped brood and a number of queen cells. Right on schedule. The other one, tho, is a complete mystery. It has eggs, larva of all ages, and capped brood. It shows no sign of ever being queenless. How can that happen? Anyone have any ideas???