Wrong location of some mobs

I have a world that works normally, but one day I can't enter the world. When I tried to enter it says loading terrain, but it lockes there. Then the game returned me to the main menu. I tried to open the world in server to see if I can enter, but when all is loaded, the server window says wrong location! qg [Bat] (look it in the picture). Now I still cannot enter my world.