Thank you for the photos. Your port OSC port settings look correct.
In ONYX, if you click the “Update” button for this device’s OSC settings to synchronise them, does it then initially function as expected?
We have recently released a beta version of ONYX, that includes some tweaks to OSC…
Onyx Beta 4.31.1296 (RC2) - ONYX / Onyx Betatest - Obsidian Control Systems
However, I cannot guarantee whether these tweaks will have any affect on the issue you are encountering.
Edward