Mac USB Keyboard Cntrl + F# commands not working properly

Hello folks,
I have a mac keyboard connected to my MBA through USB, the issue is that the control + F# shortkeys don't work properly.
E.g pressing ctrl + F3 should take me to the desktop ( the sliding movement of the windows ), but instead it switches between windows or something..
Even though it says in the system setting that pressing ctrl + F3 should take me there.
The keyboard in question is a Mac keyboard also. The commands works just fine when I click only the F# buttons on the MBA's keyboard.
Anyone has stumbled upon this previously or know any solution? You gotta love the Mac keycommands.
Thanks

Apple menu -> System Preferences -> Keyboard (and Mouse depending on Mac OS X revision) -> Keyboard
change the use all F1, F2 etc... keys as standard function keys setup.
Command + key usually works for control commands you are used to on Windows, when working with Mac OS X applications.

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