I can’t build or break on my island

[Earthkuick]

So basically I can go to my island with /is go yet I can’t break or build on my island. It just says ‘You’re not allowed to build/break blocks on this island!’ I still have access to chests though. My screen has this red highlight that you get when you go near or cross the border-I also don’t see my border anymore. Please help.
Thanks in advance.