I just re-did the song from scratch, with a new file and manual entry of chords. It worked fine with realdrum "Jazzbrushes". Then I changed the realtrack after the intro to "Jazz" (tempo is 140) with the F5 key menu, and darned if one of the measures then played "A" substyle in a "B" section!

I'm thinking that this might be part of the way "Jazz" realdrums plays at 140 tempo. But never heard this before, and it sounds out of place. I'm befuddled!