are you sure you have actually received any transactions?

this is just my guess but maybe that 0.203 bitcoin that you saw was an unconfirmed transaction that was double spent later on so you never actually received it. or maybe the private key you imported is already compromised and you did receive it but then it was spent by the other person(s) who have the key.

try using a block explorer to verify that the addresses in your wallet actually have a balance.