The queen is the most important bee of them all, laying eggs to expand the colony, but when it comes to collecting honey she can bee a bit of a nuisance. Although the supers are just for storing honey good old queenie doesn't know this and will sometimes lay eggs in them which makes harvesting the honey difficult. You can prevent her from getting into the supers with a Queen Excluder. This is placed directly on top of the brood frames and has holes big enough for the workers to get through but too small for the queen, preventing her from climbing up.
The beehaus comes with four queen excluders, one for each super, but you may want to invest in some spares.