In USTA League play, the double bump used to be rare. It hardly ever occurred and when it did, it was newsworthy. In 2014 though, while not common place by any stretch, it did happen a lot more than in the past.
I wrote a few months ago that double bumps were very rare, just 25 my count at the end of 2013, but there were a whopping 160 in 2014. In the grand scheme of things with a few hundred thousand players, neither number is very large, but it is over 7 times larger this year than last.
Whether this was a one time event as adjustments were made in some sections this year or we will see this more often will be determined. But it is certainly interesting to see happen.