I'm quite new to Electrum, and I don't understand the behavior in the last transaction.

Say I have 1 btc in the 'change address' A of Electrum, all other addresses are empty. Then I have made a transaction of 1 btc to 'receive address' B with a fee of 0.0001 btc. After that electrum shows 0.9998 btc in 'receive address' B and 0.0001 btc in 'change address' C.

I should mention that I have "use change addresses" enabled in the gui client.

What happened??? I know that 0.0001 btc was spent as a fee, but why is another 0.0001 btc transferred to another change address?

Can anyone explain it?