I know this thread is getting a bit old, but I'm bumping this because I'm having the same problem. Two days ago when I was playing I got teleported into the ocean when I tried to enter the palace in Montt. After using 3 portal stones I was finally able to enter the palace successfully...

...and then I wanted to enter the palace again today, but I got teleported into the ocean, three times. I don't want to waste my portal stones anymore. ): Isn't there a solution or fix for this?

I've read this thread and what people have said about the Gathering Hall button, but I don't know what that is, I only started playing 3-4 days ago. It takes me to this harbour but I don't know how to get back to Montt from there.