My server won't spawn mobs or give any food decay

[bigpasty]

When I originally created the server, I had it under creative. I built some things and was able to switch it back to survival. But for some reason, there is absolutely no food decay, and there are no mobs. I have my spawn mobs setting on, and difficulty on normal, I have restarted the server several times and I'm very confused as to what's happening to my server. Has anyone had the same experience and been able to fix it?

[_Tarna_]

Do you have any plugins on your server? If so, can you send a screenshot of the /pl list. And are you sure your server is on norml difficulty? Try doing /difficulty normal in game and make sure you are op. If not, run /op <player> in the server console which can be found under the appearance tab on the panel. 

[CoolProgrammer]

Go to your Dashboard and go to Settings tab of your server.

Here, you can find some settings like these:

 

Then check if they're disabled. If so, enable them to your liking, and then restart the server.