Warning !!! It is important

Bitcoin and the Double-Spending Problem

 A double spend is where two different transactions sent into the Bitcoin network are trying to spend the same account balance.

Bitcoin naturally defends against this by confirming which the transaction which is included in a block first.

If two transactions are sent into the network using the same private key and the same funds but sent to different bitcoin addresses – then as the transaction propagates through the network one half of the network will accept one transaction and the other half, another. 

Don't send or receive Bitcoin now as Blockchain is still have to take some time to settle down. Wait till it is fully running on new Blockchain

You can find more info at the google.

Be careful