It's anti cheat. Ask a moderator to tp you away when you log in and it should stop the problem from happening.
Do you get time to see the game, maybe enough time to do /spawn or copy paste that? Otherwise let us know your ign and we will teleport you next time we see it.
So I have updated info on this thread here. According to a friend of this person in question. Apparently this player cannot get on skyblock at all, it keeps showing a network error/connection error on their account each time that they log in. I don't know if there is anything you mods, or Cyp, or noobcrew can do, but this is the information that I just got.
NoCheatPlus isn't letting me on either because of the packet limit. I haven't been able to join without minechat for a day or so. We really need to raise the packet limit and the bar for what is considered flying.
Until they edit or remove the plugin, it'll be there lol. But it should be fixed eventually. You can request to have the thread locked if your issue was solved x
The anti-cheat was removed, you should not get kicked for flying anymore. If you are still getting kicked, PM an online mod to TP you to spawn.