BuddyPress.org

Hi guys. How are you. my website is done with buddy press. Beginning from today i start to invite my friends to it, and 3 of them registered today,two users already did it before. the thing is that when anather my friend wanted to register she did it, but she was not able to log in, and she was not listed in newly registered members list at all, then other two also tried, they did being registered, but they are having the same problem, and i can not see them in members list.
At the same time i did not receive in my email that the last person was registered, the confirmation did not came, as i am an admin of website. i did check my spam, no. at the same time i can not see her in ajax chat online, but she is telling me that she is sitting up there, and i am sittin also online. interesting thing is that the green round flash in ajax somehow bumped to drop down menu in there, it is also strange. i checked my mysql admin all of 9 users are being available there. But are in website in members i can see only 5 person. pls guys i was wondering if you pls can help me, i would really apreciate your help.