The problem is always on the second to last page of every chapter. If you look at page 2 at the far right of the second line you'll see part of a character & then at the beginning of the second line on page 3, the first word is missing part of the first letter. The word is "didn't" and is in this line:
<p class="calibre1">Feeling guilty for his grousing, Teddy glanced over at Gabriel, but didn’t speak. He fell into step with the marshal as they headed down the main street of Crystal City. They walked the length of the entertainment district past the saloons, brothels, and dance halls without encountering a single person.</p>
I'll look for the stylesheet later but I now suspect the problem is with MapleRead SE, not Calibre.
OK, I think I found the stylesheet.css for the line above:
.calibre1 {
display: block;
text-indent: 1em;
padding: 0;
margin: 0 0 0.2em
}