I don't know. If you have done what I said above, the teleport should take you to the Island. If not, it sounds to me like a Larian support issue. Check your quest log to see if you're missing anything meanwhile.
I'd like to close by quoting Bellegar's famous last rhyme:
"Cursed be the mother that bred thee! The wench must have been a hell-spawned banshee!"
it is because of my mistake,or because of some systems bugs or something like that?