Add server to favorites problem

I noticed that when I try to add a server to my favorites through right-clicking, the server is not added. Only through enterring the IP does it work. However, today I also noticed that the gmod tower server I added to my favorites through right clicking on the steam icon in the lower right hand corner of my desktop, does not appear in gmod favorite servers. I cannot re-add it by any method. Is this only an isolated incident since the server is down? Why can’t I add servers to my favorites through right-clicking?

i dont know the soloution mate, but i have the same thing even with the tower thing lol.

I have two servers in my favorites already, but I think I added them with the IP address.