Yes, there are bluestone chips there, and it does seem strange that you’d take a hammer to something that was sacred elsewhere.

We just don’t know do we... the stones might have been the spoils of war, or maybe they needed a bit of ‘reworking’ to compliment the new site. Maybe a few extra ‘new’ bluestones were needed to sit alongside the originals (we see that sort of activity in modern times – carrying off, reworking, adding to etc).

Ach, it’s fun speculating :-)