I can see "7" in the big screen in the middle and "undefined" under it and they are both blinking. when i press a button example shift, now i can see the same "7" in the middle and under it "shift undefined" and now when i press 1 i see "49" in the middle blinking and under it "shift 1 key" and when i release 1 i can see 7 and shift undefined blinking again how i can get it working?