I'm experiencing something slightly strange.....

First of all, I used my Dogecoin to get my 4.6 coins, worked a treat - transferred them to my exchange.

Next, I used my Bitcoin wallet to get my 4.6 coins, they came into the wallet fine, but...
When I now try and transfer them to the exchange, it say's that "the passphrase entered for the wallet decryiption was incorrect"

Now, there's no chance on earth I'm using the wrong passphrase - I type it out and then copy/paste it into the box, so I know there's no mistakes.

Anyone else experienced this problem? I didn't have the issue with Dogecoin generated Clams - just my BTC.

Thanks in advance

Cy