DarkRP 2.5.1 Sandbox Tab Menu

I started up my server and I tried to go to the Tab Menu and it was a Sandbox version. Can someone please help me. I’m running DarkRP on a dedicated server.
I’ve tried the following;

-Installed latest DarkRP
-FAdmin_IsScoreboard 1

Please help me.

Have you told the server to set default gamemode to DarkRP?