Compiling for Kindle - small caps issue

When compiling my novel, I’ve elected to make the first three words of each chapter uppercase, and I’ve also selected “use small caps” for those words. When I compile to .pdf for print, this works just fine, but in one chapter, where the first sentence is only four words, I am getting the following:

Bascially, it is doing all caps in a smaller text size instead of small caps, and then making the last word of the sentence also in that smaller text. The next sentence is in the right font size as expected.

But when I remove that four-word sentence, so that a longer sentence is the first of the chapter instead, I get what I expect (and what appears for every other chapter):

Has anyone ever noticed this before?