Wait a minute... based on your world map shot: you hadn't explored anywhere but two maps, ice veil and somewhere in kelp forest? But you can't do that in the main game.
So I ask, were you using a mod for this? (specificly, the "Native" mod?) 'Cos if so it could be that I messed up while making that mod and accidently saved an edited map over the main game map... Cos I'm sure there are no monkeys there normally. xD