Mobs and minecarts are moving slowly in just certain parts of one of my worlds

Map sometimes doesn't update player position while in minecart

Server Crashes (Possibly when generating new chunks)

Server deletes player data file

Door Closing Occasionally Produces 2 Sounds.

Normal In-Game Music Continues to Play Over the Jukebox Music

"Time to Farm" achievement only received when wood is used to make hoe