Today I just imported my wallet to blockchain.info and inmediatly notice there is 3.6 bitcoins missing!

Aparently its just one transaction that is missing in blockchain.info, taking a look at the wallet in bitcoin-qt in my computer I just notice this transaction was recieved using a address that dont appear anymore in my list of incoming addresses. Is there something I can do to resolve this issue? I'm a bit worried that this transaction could be lost...

Sorry for my bad english and thanks for any help