This has happened to me before with my v4.5 last time I ran it, though I kept getting boys. I did eventually get a girl after the fourth or fifth generation! I doubt that your V3 is glitching, but I do think this pattern is uncommon? With Dream Town I know the more girls you get you have a better chance of getting a boy next time and vice versa, but I'm not sure if the same applies to the Connection line.
It's completely random. It's a 50-50 case per egg and you're just lucky (or cursed, depending on how you look at it.) to have gotten six females in a row. The longest chain I've gotten was four females on my P's.