Looking at the reports, it looks like it is tied to time as you prefer in the "Watch/Warning Graphic", but the set of times they show changes based on the time of the report with greater resolution/more dots earlier on. They issue a forecast every 3 hours at 2, 5, 8, and 11.

Essentially, they show 3 days at 12 hour resolution then 2 days at 24 hours.

2 and 8 show 6 hours later, then 12, 12, 12, 12, 12, 24, 24.
5 and 11 show 9 hours (I think) later, then 12, 12, 12, 12, 12, 24, 24.

So 2 reports use 8's, then 2 reports use 2's.

It seems the case of the Hampton Roads Fear Mongering is just a case of the hurricane slowing down to the point that the projection has it showing up close to the same point 6 hours later around the same time the algorithm switched which set of times to show.

In any case, if your goal actually is to see how the projections changed over time check the link below: