I guess there are two counters, one for total move goal and one for 200% move goal. And I think there is no context between them. The award for 100 total move goals just looks at the total move goal counter. So that's why I think you have the same problem.
On other websites I found that some people have the same problem with 300% and 400%.
I disconected my Apple Watch und rested my iPhone with iTunes. I set it up as a new phone without a backup. And the counter of 200% move goal showed the right number, till I reached the 200% again. Same failure as before, wrong number of 200% move goal.