dg and chi o

You're not a big grade risk. If you have over a 3.0, that's a really good thing. Grade risks are below a 3.0 for sororities. And hey! Good for you! You made a good impression with them! Why question why they like you enough to invite you back?

A 3.0 is not a grade risk. Believe it or not, there are girls going through with lower.

Good for you!!
I have met some girls who are going into rush with a 2.7! They got upset that they didn't get asked back to the houses they wanted. It doesn't matter if you have a 3.2 or something like that because you're in the green zone. Sure some sororities will be a little cautious but they're like that with EVERYONE which makes first impressions really important. Don't question why they asked you back! They like you so far and that's good enough for them!!