Congratz on the new babies! if you keep mom away from other males, she will still continue to have a litter of fry every 4 weeks for the next few months.
when you put her back in with a male donot be suprised if the male goes crazy chaseing her all over the place, once a female gives birth the males can smell it and all go crazy trying to mate with her.
are you talking adult females? many times older females will become "crooked" after having a litter, it happens when they become too old and once it happens they normally do not have another litter before they pass away.
if your talking about young guppy fry, its a common problem called "bent spine" while its not lethal in itself and guppies can reach adulthood with bent spines, oftentimes they simply die before then and if they do make it into adult hood they are normally thinner and less hardy/active and never birth any fry or are able to mate to a female.
Well that's okay of they don't give birth to baby's cuz there are already to many and I'm afraid that the tank is going to crash soon !! It's a 20 gallon.
Anyway about the V fishes should I just throw away all of the bent spine ones so one day the whole tank isn't full of V fishes but I don't have the heart to flush them down thr toilet when there still living ....