So I have a survival server that I play with my friends, and we made it to The End... although the stronghold didn't generate, which is also a bug. After we killed the Ender Dragon, we went the an End Gateway and explored for a while. I was the only one to survive and make it out, but when I went through an escape gateway, it led me to another escape gateway. When I went through the one I came out in, it had made a link in both of them, and I got teleported back to the original one. I kept trying this and nothing would change. I did a /tp command to leave, but I don't know what was causing it. I have 2 portals now, both of them have solid blocks around them, and it happens to both of them.