BuddyPress.org

@per4mance
Have you tried the basic troubleshooting procedures by deactivating all plugins other than BP and reverting to bp-default or twenty twelve theme to see if the same issue persists? If this clears up the issue then it is either the theme or one or more of the plugins in which you can use the process of elimination by re-activating each one individually and testing the registration each time until you find which plugin(s) is causing the issue.