COMMAND ISSUES
Are they bedrock players? If so you need to put an asterik * before their name in order for the commands to work. If not, that is very strange, if you're on PC you can tab names. TIME SET ISSUES
As for /time set, if you're playing 1.18.1, I also noticed this issue particularly with essentials. If you do have essentials, do /minecraft:time set <time> This is likely due to you having an outdated version of Essentials. ACTIVE SERVER ISSUES
If the server is running also, it should show up as 'Online' on Minehut. If not online, what does it show up as? WORLD RESETTING
For resetting the world, be sure to turn your server fully offline, reset world, then start it back up again. Other ways may be buggy to work. ADD-ONS NOT WORKING
Add-ons panel is a bit outdated atm, but this is mainly because custom plugins are in now. Make use of that and be sure your leaf decay plugin is configured properly and supports 1.18 or can work on 1.18. This isn't really Minehut's fault more so the developer is, or the fact the plugin isn't configured/outdated