Yup, this is a known glitch caused by how the player interacts with "NPCs". In order to get the player to not run up to the Giant when they click it (which I think we can all agree would be dangerous... I mean, he's a Giant!), we set the Giant's interaction offset to the very top-left corner of the screen. In most zones you can't get there, so as a fallback your little guy just interacts from where ever he's standing. In zones where you can actually get to the top-left corner they'll run up there before interacting.

Probably not something we're going to take the time to fix anytime soon, as we've got bigger fish to fry! :D