Heading underline doesn't respect right class

[suedunham]

I don't know if this is a bug or just my own error; please forgive me if this is misplaced. I'm using the <WRAP right> class to create an infobox, and it's mostly coming together. My problem is that some heading styles don't respect the column boundary.

I'm using the Yeti bootswatch theme in the Bootstrap3 template, and the headings there are styled with a line underneath extending to the edge of the page. In this case, it extends right on through the infobox. Specifically, I'm surrounding three tables with <WRAP right 28%>...</WRAP>

How do I cut that line off at a more appropriate place?