oh my

I generated a wallet with the offline-wallet-generator on May 5th. Dependency issues kept me from compiling the source to double check and I wanted to start mining. Now I have about 500 Loki sitting in an address LBVj***. So far so good, but...
I thought I'd like to take a look at the mined coins, downloaded the now available linux-cli, synced the blockchain, imported the wallet and... well this one says empty wallet, address is L9R6***, view and spend key though are the same. I really don't think I made a mistake back then, been doing similar procedures quite some times without mistakes, always double checking. Well, my mistake should have been that I didn't bother to try importing the seed earlier...
Question: did the offline-generator produce a faulty address or can I somehow recover the matching keys or is it lost forever?