Peony Flower Appears When Smashing a Large Fern

Ok, So i was playing Minecraft Snapshot version 14w33c, And i was going to make an area for a building, but there was too many large ferns, so i started smashing them, and when smashing a Large Fern, a Peony Flower sometimes pop up (This also happens when you smash Tall Grass). I hope you guys could fix this.
Greetings
/PrimaVodka A.K.A Bastian.