How did you enter the nobless quest instance of old Talking Island? :) Also did you ever try go to the Steel Citatel in game? You can swim across the island, go near the second half part until your map bugs and says you are in the 2nd area, you PR and get in the old oasis.
It's the 7s quest "instance" ? When you need to go inside the church to speak to the priest to prevent him from something isn't ? But how can you entering there on 105 lvl ? Isn't a low lvl quest ? Or maybe you never finished it after you took it ^^'