Having issues with Wii Sports Resort

So I've been frustrated to no end in my attempts at ripping the actual model for Wuhu Island from this game.

I know the exact location of the file, I have all the textures, my only issue is the geometry of the island itself. It's a jumbled mess.

You've got part of the volcano here, the other half there, the road is floating over the island, etc. Here's pictures for reference: https://imgur.com/a/tDQuG

Is it a problem with the .iso, or did I do something wrong?