Laptops, on rare occasions can turn their ‘num lock’ on by themselves. As easy as it can be to turn it back off, it’s just that it can be very confusing for someone who doesn’t understand the problem. Here’s how to turn ‘Num Lk’ off if you want your keyboard acting normal again: hold ‘Fn’ and hit the ‘Num Lk’ button. (You have to hold Fn while doing this, because otherwise, the computer will think you were trying to press ‘Scr Lk’, or scroll lock. I don’t know the layout of every keyboard of every computer laptop ever made, so it might be different for you.).