We haven't yet been able to confirm any cases of this happening. But all dances are logged and we're happy to keep checking them. Please make a ticket and say that a programmer asked you to make the ticket, and ask them to double-check your dance logs for you. It will help the more details you can provide about the dances you think have gone missing (usernames and approximate date/times of when you got them would be helpful). Sorry I'm not able to help more!