We grafted last friday and put them in the builder. All should have been capped 3 days ago according to my calendar. Went in to remove them today to put in incubator and found 4 that had plump larvae in them and accepted but not capped. Don't think the selected larvae could be 3 days too young as that would be eggs. any other reason why they would not be capped ? plenty off bees and food in the builder.