You can’t use both add-ons at the same time. Pick one of them, I recommend ZUI.
If you only have 2 devices you can just uninstall the z-wave integration and uninstall the official Z-wave JS add-on, leaving ZUI installed. Then be sure to follow ZUI add-on instructions, which has as step-by-step guide on how to install. https://github.com/hassio-addons/addon-zwave-js-ui/blob/34fba51897dc81528d0f750ca7eef7189342a648/zwave-js-ui/DOCS.md#setting-up-the-home-assistant-z-wave-js-integration
https://www.home-assistant.io/integrations/zwave_js/#advanced-installation-instructions:
