I noticed that my server was only in day light, I tried to change it to night but it keeps changing back..
Maybe NoRain? I know there's a plugin called "AlwaysDay" that handles day/night and weather, maybe this does that too?
I'm not sure which plugin is causing it, but follow the video below and it'll show you how to troubleshoot your plugins, allowing you to quickly and efficiently figure out which plugin is causing the problem. After you figure out which plugin is causing the problem, you can either deal with it yourself or let us know in this thread and we'll try our best to help! Video: