Hi folks,
I'm also a Hubitat/Z-Wave newbie facing this issue. I bought one of these, saw "numberofbuttons" =1. Figured it was defective and bought another. Same issue, so cane searching. I see some suggestions here, but not quite sure how to apply them.
When I pair the device, it comes up as " Generic Z-Wave Button Controller" with 1 button. I see the comment about "switch the driver to Virtual Button, then manually set number of buttons to =2, then revert back to whatever driver." I've added a Virtual "Generic Z-Wave Button Controller" but not sure what to do next to manually set the number of buttons.
Not ready to start integrating code since I don't know how to do that as yet.
As background, I'm using the ButtonControllers App for this (as well as a Wallmote that works just fine).
Thanks for any newbie-speed steps here.
Cheers.
Edit: After playing some more I figured out what I was doing wrong. When I chose the proper driver it worked just as outlined. 
