I've had some that just wouldn't sex until they were waaaaaayyyy old or I flipped the lighting.
Not too uncommon, but suck if you don't want to make seed.
Can't be helped, what will be will be, but thanks and condolences again.
Let me know if you do get anymore roms to root, I'll trade a clone from my stock(once they get big enough to clone, that is).
What light cycle are you running again? 18/6?