Hello,
When it comes to reaching devices through HTTP(S) RMS Connect functionality, some particular device WebUIs might not load correctly, because they might have unique WebUI aspects, which does not work properly when accessed through proxy.
You should be able to avoid this visual issue, if you would create RMS VPN hub and access your Ubquiti device through it. Such connection would not be through proxy and therefore Ubquiti should show all WebUi aspects correctly.
In case you have not heard about RMS VPN hub functionality, there is a quick youtube video showing how to start using this functionality:
https://www.youtube.com/watch?v=dfAudZR2wPY&ab_channel=TeltonikaNetworks