From what I’m seeing searching around:
“command: 2001, payload: FF” = Open
"command: 2001, payload: 00" = Closed
It seems like the device type handler (DTH) that you are using is not properly handling these events.
The only thing I know to try is to change the associated DTH with your device and test again.
graph.api.smartthings.com > My Hubs > Find the device and click on it > Edit > Note the Type (I’m curious what type does it show? I don’t see “GoControl/Linear z-wave contact” as a native option) and change it to a different contact sensor, click update and test.
You could also try installing this custom DTH and use the above steps to select it for your sensor and see if it works better : [RELEASE] GoControl Door/Window Sensor, Motion Sensor, and Siren DTH