Mimosa x orange punch

its genetics if the environment is perfect and no light light leaks. nothing you can do...

Lots of misconceptions out there on hermies. Buds pushing some bananas are not hermies. A true hermie shows male and female parts, most often you'll see flowers up top and a bunch of balls on the lower branches. Wish you included photos, 4 hermies is a lot for a small grow unless you're working with some pretty trash genetics. At work we might find 4 in a whole 4000 plant run lol.

As others have said, if it was not stress induced then it in genetics. If you let the hermie pollinate your females, the seeds from the pollinated females will be feminized seeds. If it's in the genetics, the seeds will carry the hermie trait but the first generation will have a low chance of being hermie. If you see the nanners early on, they can be picked off the plant before they pollinate others so you don't have to kill the whole plant.