How am I clearing my "move right a space" keyboard shortcut?

I have no idea what it is I'm doing, but I regularly try to use the cmd + right arrow shortcut to move right a space, and it randomly stops working. When I go into my keyboard shortcut settings for it, it just says "None". I reset it, and it works fine, until it gets reset at some other seemingly random point. Is there a keyboard shortcut to clear this keyboard shortcut? I suspect that it happens when I accidentally use the wrong keyboard shortcut while working in a VPN window or something along those lines, but I can't for the life of me figure out how it keeps getting reset.