Server says "Server is full", when no one is there.

Hello.

My server says Server is full! , when no one is there. Why? (I have 256 slots)

I tried to restart the server multiple times.

Yeah, I am.

-Admin Chat

-Advanced Ban

-AmkMcAuth

-aSkyBlock

-Basic Economy

-Bedwars rel

-Better chairs

-BKCommonLib

-BlockBlackList

-Carz

-Chester

-Colored Anvils

-Core Protect (doesn't work)

-Crazy Auctions

-Editablesign

-Elevators v2

-Essentials

-EssentialsX

-EssentialsX antibuild

-EssentialsXchat

-EssentialsXGeoIP

-EssentailsXprotect

-EssentialsXspawn

-HolographicDisplays

-Jobs

-MGBedwars

-MGSkywars

-Minigameslib

-Nametagedit

-NoTrashpl

-Party chat

-Picture login

-Power ranks

-Privatechests

-SignLink

-SlashWarp

-SuperVanish

-Sudo

-Train Carts

-Vault

-WhosAFK

-World Edit

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Please, take a note that it was fine until someone used world edit for 600,000 blocks, then server crashed and after restart this happen.

It's fine now, I've loaded the old back-up.