Keyboard being weird.

Posting from my phone as my keyboard is currently being weird. It's commands are doing things I've never seen before haha. All of a sudden the arrow keys are moving a programs window around the screen, 2 keys up will go full screen and 2 keys down will minimise. The d key will also minimise the window. Some letters are working still, et. F. Anyone come across this sort of thing before? How do I change it back?

Edit: Nevermind, I figured out that my computer was thinking I was holding down the windows key when I wasn't. On the plus side, I've learnt some new keyboard controls lol.