Hello.
   My question is where are the Bitcoins sold on the wallets online ?
I ask this because when I check the Balance of my Bitcoin Address on Blockchain.info I notice that I am at Zero (0 BTC) so I have about 0.0005689 BTC on this Account when I am logged in to the Wallet of the Address.

So how to explain this please ?
Why is the Balance of my Bitcoin Address on Blockchain.info different from that of the Online Wallet (freebitco.in) ?

Thank you for answering me.