So the bug from the explorer event is back. Visiting an adventure island will mess up the timer on the explorers and geologists. The explorers deliver on time but are shown to still be out in the star menu. You need to reload the game to sort it out. Same thing with geologists.
So the explorer event is still haunting us. Thanks for nothing BB. Would you please leave the game alone? Your programmers are apparently not competent enough to handle simple tasks so how about you stop introducing new features until you get a new set of programmers that can handle basic maths.