Keyboard acting up

[Huddle]

I have a strange problem that I don't understand. Whenever I hit some keys on my Apple Keyboard, multiple things happen. I've checked what it registers with keyboardtester.com

Hit spacebar: Spacebar and enter at the same time
Hit c: c and delete at the same time
Hit v: v and insert at the same time
Hit b: b and left arrow at the same time
Hit n: n and down arrow at the same time
Hit m: m and right arrow at the same time

And so on and so forth.

Did I accidentally enable something, or is it just broken? It just registers what I input when I do I don't use the keyboard. Thanks!