........... would I have done something wrong?
No, you didn't do anything wrong.
Is this a problem with Pardus ....
The Pardus*.iso is built to make an installation CD.
And thus it has some problems when you use it as an USB device.
I found this link
As it's not very practical, I modified what I did see there and made the Wiki page
(By the way, my knowledge of Turkish is zero.)
I still have to modify this part
to look like this one.