Why does one of my PCs show up under My Shows

When I look at the "My Shows" listing the very last item on the list is "Now Playing on Mickey" (Mickey is my desktop PC). When I select it it gives me a display with nothing on the list.

So, why is that there and how do I get things on the list. I have other PCs, why do they not show up?

One of my other PCs, an HTPC, it does show up as a Plex server which makes sense but that is in a different spot than My Shows.