Is it normal? What is my actual balance?Balance on bitref or balance from Electrum?
Why you're seeing the correct balance in your electrum but not in BitRef is that every blockexplorer only displays the balance of an address, not all the addresses within a wallet.
As explained by bob123, that is called the change address.
It's like: You payed 10bucks for a 2bucks item using your right hand(input address), you received the change 8Bucks using your left hand(change address).
If you want your future transaction's excess btc to return to the same address, disable change address in the settings.
Tools->Preferences->Transactions->Uncheck "Use change addresses"