This seems like an issue with permission nodes. Make sure the people you want have the permissions, while the people you dont want dont have the permissions.
Lckette Permission Nodes: https://dev.bukkit.org/projects/lockette/pages/permissions
Permission Nodes: https://minehut.xyz/faq/permissions
If the emails expired and you can't log in, the only option would be to use the /ul command in game, however if your world is greater than 100mb it wont work.
From the looks of it, CrazyEnchantments is not compatible with 1.16.
You can request this to be updated here, https://forums.minehut.com/forum/20-plugins/ however I believe it's already been requested.