Just checked again. Same issue. The transactions in the client don't agree with the transactions I see in the block explorer. Balances don't match.
I
edit: posted this before I saw the above response. Thanks.
yeah a block explorer only sees transactions and their destinations. It's difficult to even say that two addresses are the same wallet.
Turn on coin control. Click select inputs on the send tab. It will show you the addresses your coins are in.
If you really want your coins in the same address select the ones in the other address for the input. Remember to put the address you want all your coins into in the select change address as well as the send to address.
Paraphrasing all this from memory but it should give you an idea.