>I used metal portable pollen traps with holes like this entrance for gathering polen. Bees didn't like this entrance, they hesitated to getting in and out. Drones stucking holes and in peak times or increasing times of nectar, bees didn't want drones near brood. A big chaos in the hive...
>But tommyt and MBush are most experienced masters. May be I done something wrong...
Probably you didn't do anything wrong. Pollen traps always confuse the bees for a while as they are looking for an entrance they can get through without struggling and without losing their pollen, so of course, they don't like to go through the trap. As far as the drones getting stuck, I assume that is the drone exit, you might want to enlarge them slightly so they don't get stuck.