Why does CS6 InDesign Book epub output generate and apply new graf and character style names in CSS?

Question

I created an InDesign book composed of documents that had had no paragraph or character styles in the palettes until text was copied over from a single overall document. I worked absolutely as clean as I could.
I synchronized the book to that single overall document several times, including immediately before exporting the book to epub. My export settings disallowed any local formatting. Character styles were restricted to one named "Italic" for which the only format applied was Italic in the Font Style field, and one named "Small Caps" for which NO formatting was included in the character style.
There was, as far as I can see, no reason for any character or paragraph styles to export to anything but identically-named CSS entries. That is to say, any text with the character style "Italic" applied in the InDesign doc should have output with the same text with a span class entry of "Italic" around it.
I still ended up with p and span CSS entries with extra numbers appended to them:
span.Italic {
font-style:italic;
font-weight:normal;}
span.Small-Caps-1 {
font-variant:normal;}
span.Italic-1 {
font-style:italic;
font-weight:normal;}
span.Small-Caps-2 {
font-variant:normal;}
span.Italic-2 {font-style:italic;
font-weight:normal;}
span.Small-Caps-3 {
font-variant:normal;}
span.Italic-3 {
font-style:italic;
font-weight:normal;}
and
p.x-SECTION-BREAK, p.x-SECTION-BREAK-1, p.x-SECTION-BREAK-2, p.x-SECTION-BREAK-3  and so on.
Why would the InDesign epub output engine choose to generate and apply new spans and paragraph-level styles, which multiply the complexity of editing the CSS directly? How can I prevent InDesign from doing this?

Answer 1

Perhaps I wasn't clear. When I wrote "an InDesign book composed of documents that had had no paragraph or character styles in the palettes until text was copied over from a single overall document" I meant to emphasize  the part where I CLEARLY said "UNTIL text was copied over." The text I copied over had plenty of paragraph styles. I was trying to point out that each individual document had no PREVIOUSLY EXISTING character or paragraph styles that might have added complexity to the epub output. .
So, every paragraph in each document had a paragraph style attached, a total of maybe 20 different paragraph styles throughout the book. The only CHARACTER LEVEL styles I cared about exporting were Italic, for text that was set in italic, and Small Caps, for CAPITALIZED text that I wanted to be able to make smaller in the CSS, since I am not allowed to embed fonts and therefore have no other way of creating small caps in the xhtml files inside the epub.
So, given that I had two character styles applied to various bits of text throughout my InDesign book ("Italic" and "Small Caps"), I would like to know why there are multiple CSS entries generated: Italic, Italic-1, Italic-2, Small Caps, Small Caps-1, Small Caps-2, and so on.
Ditto paragraph styles. I had a paragraph style called "SECTION BREAK" in each document. Not only did paragraph style "SECTION BREAK" contain identical specs in each document--I know they did because I copied each from one single doc where they were being used identically--but I also synchronized the book repeatedly.  So why would the xhtml docs and the CSS output need p.x-SECTION-BREAK-1, p.x-SECTION-BREAK-2, and p.x-SECTION-BREAK-3?