Did they experience any stress in veg- last year I had 4 hermies in with my feminized seeds and couple sacs even showed up in couple other girls late flower- I put them through major stress about 2 months into veg I transferred them outdoors without sufficient acclimation and almost killed them. After they revived from that mistake I thought a good boost of fertilizer would be good and poisoned them with nitrogen to the point were all the bottom leaves turned yellow... and after they revived from that I over watered them.. I killed 10 outa 30 plants, but did learn many valuable lessons. Anyways stress during veg seems to lead to hermies. I was going to keep one because I read that the seeds from hermie plant will all be feminized- but later killed it because I then read that these seeds will be far more likely to turn into hermaphrodites with any minor stress.