Z-Wave JS 0.14.0 Breaking changes Version 0.14.0 of the add-on requires version 2025.5.0 or higher of Home Assistant Core. Features Add radio frequency region option to the add-on

By default the region is set automatically based on your Home Assistant country setting. Is that set correctly? Settings → System → General → Country.

You can also configure the region manually yourself in the add-on settings. There’s no reason to use Z-Wave JS UI just for that (although there are other benefits to doing so). https://github.com/home-assistant/addons/blob/d870f1c75842626700a1028bf83bfa94ce558303/zwave_js/DOCS.md#option-rf_region-optional

See this guide if you want to switch add-ons permanently.