I've been trying to modify my robbing screen, so I've been visiting my backyard hive late at night (10pm-Midnite). But for the last week I keep finding a large group of bees behind the robbing screen, in some kind of cluster. These bees are doing quite well and have a full size with 3 medium supers on top but they seem to be continuously robbed (or attempts made to rob) every afternoon, hence the screen and small hive entrance. They are quite busy bringing in pollen during the day and they have a miller feeder on top with 2:1 syrup plain which they readily consume. Weather has been warm here in southern California 90 degrees in the day today and down to 50 degrees last night. Are these left over robbers or are they fanning the hive? Is the hive to small to allow these bees in? In the day they seem normal except for the robbing, but these girls stay like this to late in the night. Ideas?