Number pad not registering as a trigger

Hi,

I have a slide with a numeric input field in a free form quiz. I have the next slide trigger as the last number (2) in the field. What I'm finding is that the trigger works when I use the 2 above the alphabet keys, but the 2 in the number pad keys doesn't work. 

I understand that the number pad registers as a different key stroke (even though I typed the 2 in with it). 

I can't foresee whether the  user will use the num pad on the keyboard or the numbers above the alphabet keys. I could set up a different trigger, but this is kind of bothering me.

Any suggestions would be great.

Thanks,

Wes