Hi VIP and welcome
I assume u use jOpenSim 0.3.0.15 and jOpenSimRegister 0.3.0.15, correct?
The avatar creation routine has changed internal completely in these recent versions, so it is important that they match. jOpenSimRegister 0.3.0.15 will not work correct with jOpenSim 0.3.0.14 and vice versa.
If u still use 0.3.0.14, I recommend to update to 0.3.0.15 since the cloud issue was known in older versions and should be fixed by now.
Avatar appearance has changed in a recent version of OpenSim (prior of 0.9.x, dont know when exactly). Internal changes will be updated once the account logs in. If u login with the avatar account, is it also a cloud or does it rez correct? And if yes, did this maybe solve the cloud issue for new created accounts?
If that all does not help, it might be necessary to create a new avatar account (via console or jOpenSim backend) and transfer everything from the old one.
Greetz
FoTo50