Discrepency with TX amounts with TBTC
What you have is something called a change address. Your client used an unspent output of 1993.07508548 BTC and split it into two outputs (1993.06549173 BTC &amp; 0.00859375 BTC). The larger output is considered change back to the sender. I would imagine the 0.008 BTC output is yours as that is the output displayed on your client.

If for some reason you wish to spend this 0.008 BTC and the amount you wish to send is 0.004 BTC, the output of this transaction will act as the unspent output of the new transaction you wish to make. The total transacted will be 0.008 BTC even though your only sending 0.004 BTC.

Here is some documentation on unspent outputs