Males, rather than females, are much more likely to fight over mating rights. Mature females will cohabitate nicely, but mature males will not, much like with most animals. Two males together is not a very good idea as one will always become dominant and deprive the other one of food and shelter, sometimes even attacking and killing them.
If your leos aren't mating, that's either because they're too young or too old. Between 2 and 6 years is the best time to mate leos, any older or younger and it isn't going to work as well. Your leos might also just be uninterested. If you really want to breed them, try different males or females.
yea it is perfectly normal for he females not to fight, if you had two males and 1 female then they will fight but because you have two females and one male they wont fight. they are probably not ready to mate or they could have mated over night and you dont know but if you see any thing strange about onw of the female look on the internet for info because she might be pregnant.