command key hides windows

Hello,

I've recently been having this issue where every time I press the command key all my windows "hide." I can press the command key again and all my windows are unhidden. But this gets in the way of any shortcuts that need the command shortcut like copying, pasting, cutting, etc. I was wondering if anyone knew how to fix this problem. I don't have nay hot corners activated nor have I added any custom keyboard shortcuts. Thank you!