The way x13 is working, everytime a transaction will be created, it will move all the coin under the address in two addresses. The first one is where you want to send the coin and the second one will be generate in the treeview of your address. You'll be able to see it in the Coin Control Panel by clicking on the arrow.
By the same occasion, your balance for the address you have registered on MyMineum will go down to zero.
To avoid this problem, simply send back your coin available in the generated address into the good address.
We are checking if we could have any other solution to avoid that situation.
HOW TO CHECK:
1) Click Settings > Options > Display. Now, Check box called "Display Coin Control Features (Expert Only)". Click Ok then close the window.
http://i.imgur.com/PEEmF4X.png
2) Click Send Coin > Inputs... . Click the arrow at the left of the bar (first column). You'll see that your coin are now on another address (MZWX...BMj in that case). Check the box at the left of the second line and close the window.
3) Send all your coin to your main address, just like if it was a normal transaction.
http://i.imgur.com/AdTnctM.png
Thanks a lot,
Anthony Rail
http://i.imgur.com/Y3XrHJi.jpg