All of the other HTML (web) results are centered, why aren't by-stage detail results?
Well, they are if there's only one string per stage.
If there's more than one string, I've had the by-stage results left-justified. Particularly for the Classifier, I think that looks neater because the String 1 column on one stage lines up with the String 1 column on the next stage, etc.
But if you want to center the by-stage results, the Web Page Wizard has a check box to do so. It will only appear if at least one stage in the match has more than a single string.