If you have not *registered* yuma300 in 0.8.0, how come it is registered on the blockchain now?
How did the funds go into that account if not you have done that?
To me it seems that this account was indeed "registered"(!) already in 0.8.0, but from an outside perspective there is no way of tell.
Assuming that now one else has taken your account (and funded), then YOU have to have the keys somewhere. Probably in you BTS 0.9.3 installation..
Please go there and verify that you have indeed not registered it there (it will probably tell you that you have registered it, though, if that is the case, you should be able to export the required keys to access the account and its funds)