Sorry to hear about the recent hermie problem but thats feminized seeds for ya, little temperamental bitchs that they can be !
I'm more of regular seed man myself taking clones from a female plant only, even tho i've grown the same strain myself from a regular seed female/clones i've still managed the odd few seeds to several on a plant or 2 of my own grow of Blue Mystic over the last few grows or so....
Yup hermies can happen on regular seed also... i guess thats a side effect of forced growing indoors ?
Normally occurs for myself in the last few weeks before cropping & often get semi formed seeds i find in the cured bud... not many tho !
Still smokes pretty darn good
Not sure what has caused that with my own grow ? but might be partly due to the light regime used... to which i need to monitor results abit more before i can decide on the matter !
Or even possible light leak via passive vent !
Even tho a good wipe down of grow area with a diluted bleach solution after every grow has proved fruitful to reduce seed content has proved worth while, so cross contamination from past grows does enter the equation along with any bud handled from a unknown source which may leave pollen on your fingers/cloths when handling your plants !
Practice good hygiene when handling your plants, if handling strange bud before hand... wash ya hands