If you have the same issue with several nodes the chances are there's an issue with the underlying library.
But one thing to check...
Have you re-installed the library following the instructions node-red-contrib-homekit-bridged?
Have you rebooted your device? There was an issue with the avahi module not resetting properly a while ago, which a reboot would clear.
If you have done the above I'd suggest opening an issue against the node-red-contrib-homekit-bridged node as it is still appears to be being actively developed.
