As i type right now, i have to hold down the “Fn” key just to get normal letters. I don’t know how it happened, but I’m on a laptop and the only way for me to get the “u,i,o,l,;,k,j,m,7,9,0,/,p” keys are to hold down the “Fn” key. It is purple on the lower left of my internal keyboard.
One of the compromises laptop manufacturers had to make to support a full-sized keyboard into the space of a laptop is the numeric keypad most keyboards have. What they’ve done is overlaid it “on top” of the regular alpha numeric keyboard.
The trick, of course, is noticing it, and then turning it on — or in your case, off.