Why can't I join the Discord server anymore?

https://preview.redd.it/w0vveo7p103h1.jpg?width=720&format=pjpg&auto=webp&s=7ad86d3ecfc47dc2d933054c9803bdb2968b7a3c

I actually joined the Guts & Blackpowder server on Discord, but I was kicked or banned. Why? Because I couldn't find the server on my Discord server. When I tried to rejoin, I couldn't because the system couldn't accept the invite.

Can anyone help me? I'm always missing out on information.