Comment highlighting in Reach behaves inconsistently

I have a specialization domain with specialized vocabulary based on section (hwVideoScript) and p. When I select one set of tags based on p and add a comment, the entire hwVideoScript is highlighted. When I select others (these nested in table entries, only the selected element is highlighted. All of the elements in question have @cid applied, and I can see no discernible difference in the markup. Is there something else I should be looking for?