Did you add any other files or folders to ~/desktop? If not, then the bin folder is all that is there, which you created with the mkdir command.
I suspect you may have wanted to create ~/Desktop/bin. The Desktop folder (with capital D) is what you see when you boot your system, and you may have files or folders there that is what you expected to see. Linux is case sensitive, so Desktop and desktop are not the same.
Open an terminal and try both of these:
Code:
ls ~/Desktop
ls ~/desktop
The ~/ is a shortcut for your home folder. So the following should give the same results:
Code:
ls /home/jasmine/Desktop
ls /home/jasmine/desktop
# Change 'jasmine' to your real user name, if different from this example.