3) is not meant to be completed on the island, so it's working as intended.
5) Withermoore only appears if you try to unlock the barrier when you don't have any source, quest completes after that. Not sure if it should close in a different manner if you don't need his help, so it could be bugged but it could also be working as intended.
3) Saheila acting wrong.
5) Quest is still active after I've done everything right.
