It's normal for them to flare at each other, but if they are doing it all day then that's not a good sign. If you want to continue to keep them in the divided tank then make sure there are plants in front of the divider to help block there view. Also, having a nice little cave or some sort of hiding place for each Betta would be great as well.
How big of a tank are the in? I would make sure that it is at least a 5 gallon that you are dividing, NOTHING smaller then that.
I also agree with drama, there is no way you should have more then one female or any fish for that matter in a 2 gallon tank. 2 gallons are just large enough for one Betta. I would highly suggest removing all but one female and have separate bowls for all of them. If they haven't fought yet, they will and you will have dead fish in the end.