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i have that much drone brood this year also and it is more than usual. yes, the red dot is probably a mite. i don't remove drone cells. you can. i know some do it for mite control. if you only have a few cells with misplaced eggs, don't worry. new queens will do that. sometimes it just happens. it's worth keeping any eye on. the combination of lots of drone cells, etc. could mean your queen is getting old, but maybe not. what does the brood pattern look like and how much brood is there compared to earlier and the other hive? any queen cells in the hive? might they have already replace this queen and you are looking at the brood of a replacement?