Server not showing in server list

So I'm running a server at a hosting company and have had a couple of issues every now and then, but nothing I haven't been able to solve. Now I have a problem with finding the server. It is online, I can find it on Steam Servers, I can find it on https://arkservers.net/, where it is online, but I cannot find it in the game itself. Does anyone know why this happens? It is fully updated, running the same version as my computer.