I suggest that the bees are getting reed of the eggs is because the cupkit system frame is a wooden one and lacks lot of wax i mean it would be more accepted if it was directly fastened to a wax frame,.
Secondly Nicot coupularve system has a mistake in its brood sample diameter, I put it for one month in the hive ,to find out there were seeled drones in the nicot samples
Secondly bees will get reed of eggs in the system whenever the system is far from the brood chamber, i suggest for better acceptance ,use karl jenter and put it in hive in brood chamber for at least one week before use and let the queen pass over there , u can also put some honey on the white plate to be polished by the bees try and be patient ,good luck
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