[Waylander]

Ok, here's what I've found.

This comes up where there's a space between paragraphs that shouldn't be there: <br class="calibre9"/><br class="calibre9"/>.

And here's what's in the CSS stylesheeet:

}
.calibre11 {
  font-style: italic;
}
.calibre12 {
  font-weight: bold;
  hyphens: auto;
  line-height: 200%;
  overflow-wrap: break-word;
  word-break: break-word;
  word-wrap: break-word;
}
.calibre13 {
  font-style: italic;
  line-height: 1.2;
}
.calibre14 {
  height: auto;
  text-align: center;
  width: auto;
}
.calibre15 {
  font-size: 0.75em;
  font-weight: bold;
}
.calibre16 {
  display: table-column;
  border-right: black solid 1px;
}
.calibre17 {
  display: table-cell;
  text-align: inherit;
  vertical-align: inherit;
  white-space: normal;
  padding: 0;
}
.calibre18 {
  color: gray;
  display: block;
  height: 0;
  margin: 0;
  border-top: black solid 1px;
  border-right: currentColor none medium;
  border-bottom: currentColor none medium;
  border-left: currentColor none medium;
}
.caption {
  border-bottom: 0;
  border-top: 0;
  display: block;
  margin-bottom: 0;
  margin-top: 0;
  padding-bottom: 0;
  padding-top: 0;
  text-align: justify;
  text-indent: 1.5em;
}
.caption1 {
  border-collapse: collapse;
  border-spacing: 2px;
  display: table;
  height: auto;
  margin-bottom: 0;
  margin-top: 0;
  text-align: center;
  text-indent: 0;
  width: 100%;
  padding: 0;
}
.caption2 {
  display: table-row;
  text-align: center;
  vertical-align: baseline;
  width: 100%;
}
.center {
  border-bottom: 0;
  border-top: 0;
  display: block;
  padding-bottom: 0;
  padding-top: 0;
  text-align: center;
  margin: 0 1em;
}
.centered {
  border-bottom: 0;
  border-top: 0;
  display: block;
  line-height: 1.2;
  margin-bottom: 0;
  margin-top: 0;
  padding-bottom: 0;
  padding-top: 0;
  text-align: center;
}
.chaptertoc {
  font-weight: bold;
  line-height: 200%;
}
.content {
  display: table-cell;
  text-align: center;
  vertical-align: inherit;
  padding: 1px;
}
.ec-lmr {
  font-size: 0.75em;
}
.ec-lmr-12x-x {
  font-size: 1.41667em;
  line-height: 1.2;
}
.ec-lmssbx-10x-x {
  font-size: 1.125em;
  font-weight: bold;
  line-height: 1.2;
}
.figure {
  border-bottom: 0;
  border-top: 0;
  display: block;
  padding-bottom: 0;
  padding-top: 0;
  text-indent: 1.5em;
  margin: 0 auto;
}
.fontsmall {
  border-bottom: 0;
  border-top: 0;
  display: block;
  margin-bottom: 0;
  margin-top: 0;
  padding-bottom: 0;
  padding-top: 0;
  text-indent: 1.5em;
}
.footnotes {
  border-bottom: black solid 1px;
  border-top: black solid 1px;
  display: block;
  font-size: 0.75em;
  font-style: normal;
  margin-bottom: 0;
  margin-right: 15%;
  margin-top: 0;
  padding-bottom: 0;
  padding-top: 0;
  text-indent: 1.5em;
}
.hline {
  display: table-row;
  vertical-align: middle;
  border-top: black solid 1px;
}
.id {
  display: table-cell;
  font-weight: bold;
  text-align: center;
  vertical-align: inherit;
  white-space: nowrap;
  padding: 1px;
}
.likesectionhead {
  display: block;
  font-size: 1.125em;
  font-weight: bold;
  line-height: 1.2;
  text-align: center;
  margin: 1em 0;
}
.likesubsectionhead {
  display: block;
  font-weight: bold;
  margin: 1.33em 0;
}
.minipage {
  border-bottom: 0;
  border-top: 0;
  display: block;
  margin-bottom: 0;
  margin-top: 0;
  padding-bottom: 0;
  padding-top: 0;
  text-indent: 1.5em;
  width: 100%;
}
.newline {
  display: block;
  line-height: 1.2;
}
.noindent {
  border-bottom: 0;
  border-top: 0;
  display: block;
  padding-bottom: 0;
  padding-top: 0;
  text-indent: 1.5em;
  margin: 0;
}
.pagebreak {
  border-bottom: 0;
  border-top: 0;
  display: block;
  padding-bottom: 0;
  padding-top: 0;
  text-indent: 1.5em;
  margin: 0;
}
.quotation {
  display: block;
  margin: 1em;
}
.small-caps {
  font-variant: small-caps;
}
.sout {
  text-decoration: line-through;
}
.tabular {
  border-collapse: collapse;
  border-spacing: 0;
  display: table;
  text-indent: 0;
  margin: 0 auto;
}
.td {
  display: table-cell;
  text-align: center;
  vertical-align: inherit;
  white-space: nowrap;
  padding: 1px 5pt;
}
.td1 {
  display: table-cell;
  text-align: justify;
  vertical-align: inherit;
  white-space: nowrap;
  padding: 1px 5pt;
}
.textsuperscript {
  font-size: 0.75em;
  line-height: normal;
  vertical-align: super;
}
.textsuperscript1 {
  font-size: 1em;
  line-height: 1.2;
  vertical-align: super;
}
.titlehead {
  display: block;
  font-size: 1.41667em;
  font-weight: bold;
  line-height: 1.2;
  text-align: center;
  margin: 0.83em 0;
}
.titlepage {
  border-bottom: 0;
  border-top: 0;
  display: block;
  margin-bottom: 0;
  margin-top: 0;
  padding-bottom: 0;
  padding-top: 0;
  text-align: center;
}