The DTH queries the lock for the max number of programmable users and reports that back to LUM and in your case the lock appears to be reporting only 1 user pin. It sounds like your ZigBee module may have a bug making it report an incorrect number. I’ll PM you and we can take a look at your DTH logs to see what’s going on.
UPDATE: Looks like your Yale zigbee lock firmware has a bug and it’s incorrectly reporting 1 for the number of programmable keypad users. You can try the special ZigBee Lock DTH to patch the firmware bug I’ve provided but report it to Yale so they can fix their firmware