I have found this on a number of different synthetic brushes, it seems to be fairly common. At their price point it's hard to complain, I just lather them up and shave, or like shave/brush recommends, just double down.Hahaha. I think this brush will resist a year or a two. When I mentioned the circle, I meant its initial knot shape is not uniform as a circle.
@kluber
Thanks for reporting about no glue bump in your brush.