Change the DH to the "Basic Zwave Configuration Tool" and check parameter number 3. If it's NOT 3...then Occupancy is turned off which would be my guess. When it's on there is no waiting for the hub to turn the light on. It's done in the switch. My guess is it's set to 1 which is Manual.
BTW you can use that tool to set it back to occupancy if you want.
ConfigurationValue: 3, parameterNumber: 3, size: 1
