I don't think this is cause for alarm.
I was just reading yesterday about breeders talking about how it doesn't make sense to BAT young pups, b/c they give false readings under 6 months of age. Also, being so young and having to get vaccines and such can also throw off BAT #'s
Mine have abnormal #s and I have been to a specialist whom really says that they really go by 40 and over as a Post
I hope that helps