Ummm... briefness whats happening narrows the possible ways to help you. Did you create new island with /is create? Invited friends with /is invite [player]? Maybe /is restart is needed to start from sratch if you ever playes AS2 earlier on MyM.
Sorry, I wasn't very specific, I logged in with friends, restarted island to start fresh with them, I invited them to my island through the /island menu
And i hope you go to your island using /island home or /island spawn? Sometimes island dont reset properly so u need to "restart" it again