Nas

I've had that problem too. Check your notification settings and change where needed

I think it's one of them inevitable glitches that are server related. For instance, right now, I, and a lot of other people, aren't getting notifications for friends updating their status, and that's going to be resolved.

But now, I think I'm not getting any for people quoting my posts.

your are lucky you get those notifications. I get none usually 1 or 2 IF I get lucky