New Tezos domain & wallet

Today I tried to view my Tezos light wallet and was informed the domain had been moved to a secure domain and it was necessary to rebuild the wallet. I followed the prompts and entered my 15 word secret key, and was informed the wallet had been created. But now my tezzie balance is showing as zero. And, worryingly, the public hash has changed. Do I have to import from the old wallet and if so, how do I do this? Or, have I done something wrong?