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This is caused by finishing a game, going to the smash lobby, and going back to the server you were just on. The maps aren't reset completely...
Is your island big enough? Mobs normally don't spawn within 24 blocks of a player.
December 18, 2013 for me
I guess that's why 0.7 added the end
Leafeon is my favorite. My leafeon carried me at the end of moon.