Teleportation Bug

I was trying to teleport to a destination on the coordinates grid and I was teleported 1 block too much to the east (if I were to teleport to 12 64 12 I would end up at 11 64 12). Also when I try to set a spawnpoint and the coordinates have decimals, I would get a message saying "'-1958.0' is not a valid number" or something like that.