Your plants are looking very nice! Good job!

Did you stress your plant out really bad lately? Is there light leaks in your room? Those are really the main two reasons why a plant would hermie on you. Light leaks being the #1 problem. When it is dark, make sure it is 100% dark in your room. Don't turn on the lights to take a peek or nothing. When the light is off, keep it off and never expose it to light when the light isn't on.

Other than that, good luck!