Hi there,
When you are banned (excluding blacklists and ip-bans), Minehut will state that your account was banned. Are you using a VPN at all? Are you connecting to a proxy?
/ul is no longer a command. Use multiverse to change between worlds.
Uploading Worlds (500mb limit)
Select the upload file button on the file manager, then select the world you want to upload and then press upload.
*Note that the /ul command no longer exists and this is the only way to upload worlds*
Go to your panel on minehut.com , login, go to server appearance, go down and type in the console area "unban <your username" and then type "op <your username" . Lastly ban whoever banned you.
Do what Programmer has advised. If that doesn't work I'm going to be honest, just start a new server. Unless you absolutely need it, no point wasting time getting it fixed, with chances of it happening again on that server version.
Because it's your enderpearl, if you leave I believe that it dissapears, or maybe because you left for a certain amount of and despawned? I'm not sure. Those are my guesses.