Qwerty keyboard converted the right-half to being a number/symbol pad? Might this help?
Sometimes, accidentally brushing over the keys triggers the Numlock button...or the cat walking on it...
Keyboards which lack a number keypad, [only has numbers across top line] use the Numlock button to convert almost the whole right side of the board, into a number/symbol pad,.
While in that mode, one can use the Fn button, to toggle between using letters or numbers, or, Fn+shift to get a capitol.
To stop using the right side of the board as a number/symbol pad, press the Numlock button to get the letters back.
All my keyboards, both wired or wireless, which lack their own number pad, only need to have Numlock button clicked, to turn number keypad on or off. IDK about other buttons needed for that.