Sheep spawning messes up sometimes causing large amounts of pink sheep.

While playing multiplayer using the vanilla multiplayer server jar, we came across an area in the server where the spawn code for sheep was messing up. It only happened in this area and they all spawned naturally. Each pack of 4 sheep spawned had 2 white 1 grey and 1 pink sheep in it.

Seed:110122358

Coords: Large area around x=0 z=1660

Video will be uploaded as soon as i can.

I attached a picture depicting all of the pink sheep that spawned with pink dots and blue lines marking the borders of the area they spawned in. The yellow dots are the farthest pink sheep to spawn from the center and all four directions