The BB will bounce an arrow back once in a while. It seems to do it more when it' s new. Once it' s softened up a bit, it won' t happen as often.

I would get that bow back to the shop though. It' s usually a good idea to break a new string or cable in and then reset timing and cam lean. The arrows could be bouncing back because they are not hitting the target squarely. The bouncing back seems to happen to me more when I make a bad release or hit high or low in the target.