I had the idea to move all of my existing bitcoins (10 BTC) from Bitcoin-Qt/paper wallet to Coinbase.
I had imported the paper wallet to Bitcoin-Qt and the balance there was 10 BTC total. For some reason, I then went and imported the paper wallet to Coinbase, and ~5 BTC was added.
At this point, Bitcoin-Qt still showed the balance as 10 BTC. I went ahead and made a transaction of 10 BTC from Bitcoin-Qt to my Coinbase address.
The result is that the transaction keeps having 0 confirmations, Bitcoin-Qt shows balance to be 0 BTC and the transaction never showed up in Blockchain. I have no idea where the "missing" 5 BTC are and what to do. I realize that a double spend might have occurred as 5 BTC was already imported to Coinbase from the paper wallet and I tried to send 10 BTC from the Bitcoin-QT.
Here's the Coinbase address https://blockchain.info/address/1GeQeHnJEnKfcfWonGCrj52kChyXqib5sC, and you can see the that the 5 BTC import from the paper wallet went through.
What's the solution here?
Here's how Bitcoin-Qt's transaction history looks like: