This particular server has had player high pop and queues for more than a year. Out of nowhere it doesn't appear in the "Modded" section, though it does in both "History" and "Favourited" for those who already favourited the server or played on it in the past. Now players has dropped substantially as a result. 

The server is hosted on a dedicated machine rented by ovh.com 

Anyone experienced the same? Did it help changing your IP?

I have the same issue.
I.m hosting it on a windows server2019 system.
Which have an i5 9600k ram 16gb mhz 3200.
An m.2 driver which have 500gb on it and still not showing on the server list even with the correct ports are portforwarderd and still nothing 

I have noticed FP and /or Steam lately is messing witht he way servers list.

Ive seen some of my servers pop up on the list and say the map was created hours ago, when its been up for days.

Ive submitted a bug report on this with as much detail as possible to FP.

And we wait...................

Ive had this problem for a month now. My server isnt shown in the browser or on RustIO.