You’ll sometimes see two if you’ve changed hardware, unclaimed/re-claimed, etc. One probably has an old date compared to the other. You can delete the older one. Worst case is that it unclaims your server and you have to re-claim it.
I always have a lot of web instances. They usually have different versions, as Plex updates the version on app.plex.tv. If I login from a different PC, using the browser on my tablet, etc, it will make another entry. A lot of them are usually days or weeks old and you can delete them. Worst case is you have to login again.
I wonder if it is politically unacceptable to name a FireTV4K Max “Master”. Because that name doesn’t want to stick. (But it is so named on the Amazon site…) I will try a different name…
Something is not right. I am tenacious , if nothing else.