Birdy is spot on - so make sure you keep a backup of your wallet.dat file so that you will have the private key(s) for that address.
You can always send everything from the qt client to blockchain.info to consolidate it.
Or send it to a paper wallet so you don't have to worry about it as much.
I think I understand. But then which is accurate? Block or qt?
Both, it's just that you didn't give one address to blockchain.info, so it doesn't list it (and you cannot spend them from there).
You still own 1.53337621 Bitcoins and could send all of them with bitcoin-qt.