While data being stored in the database may certainly account for what you are seeing, there is indeed some kind of problem with the used-space meters atm (and has been for a few months); from what support@ tells me, it's a rather intricate problem that requires a rather intricate fix, which is why my account currently shows around 1g used when in reality it's a hundredfold that (you can easily find out how much space an account is using on the shell by entering
du -sh .
after logging in.) Not sure how many clusters/servers/users are affected, but if you are seeing a sizable discrepancy between what du tells you and what the panel tells you, you probably are. You can write the support folks about it and they'll let you know once it's fixed, but as said, it's been quite a while already with no hard ETA in sight, so it could take a while longer still