If you follow the steps with the style sets it will cure this.


The problem is that you have that paragraph in a numbered list with the number (not the heading) set to be centered in the MultiLevel List dialog.
This is especially perplexing because the paragraphs displaying the problem do not have any numbers, but they are in a style attached to that numbering level.
Fixing that directly through the Define New MultiLevel List dialog was more of a chore than I chose to attempt.
As convoluted as it is, assigning a new style set with the numbering is simpler.