I find that when crops are up and the farmers should be harvesting crops they keep running over to the coconut trees. No matter how many times I drag them back to the farm they go back to the trees when I quit looking. So as a result they pick all the coconuts and then when the crops are gone the tribe goes hungry because they have no coconuts on the trees.

If they picked the crops first the coconuts would last longer. they could pick them while waiting for time for the new crop instead of making everyone be hungry.