From a fellow grower: Have my Gorilla Glue fem seeds turned hermie and of so, any advice so I can avoid this again?
Unfortunately, yes. This would be do to stress. Most likely having to do with lighting. Irregular light schedule, improper light schedule or ambient light leak during the dark period would be the most likely culprits. If these all sound impossible then you would have to start considering other plant stressors. Would need more information to hazard a guess in that direction.
I Vote yes (hermie) @Eagles009 has got you covered.