Hey there!
Did a little bit of research, went to Minecraft's official site and some others.
These are 4 different answers I found.
First (from Mojang) : contact *server*, it's their fault. In this case, could you tell me if it's only cubecraft or all servers? If it's only cubecraft, this is your solution : contact
support@cubecraft.net and they'll help you further!
Second: "Try setting your render settings to 2 chunks before logging in (Can't promise this will fix it)."
!! Please keep in mind I copied this from another forum !!
Third: "Hey there, this might be your DNS Resolver Cache using old data, do not worry though, there is an easy fix for this.
I am assuming you are on a Windows OS.
1. Press the Windows key and R at the same time, this should pop up a box called "Run"
2. In that box, fill in the following: "cmd" and press enter.
3. A box with a black background should pop up, fill in the following: "ipconfig /flushdns" and press enter.
4. Restart minecraft and try logging in again.
As I have gotten some questions about this method: This is not illegal in any way, it is simply cleaning your ip log, allowing your pc to use new data."
!! Please keep in mind I once again copied this from another forums, and myself I have no idea what this all means !!
Fourth (from mojang) : Join minecraft community server, they will be able to help you
https://discord.gg/58Sxm23
Hope one of these will help you! :)