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Very likely, someone used a conversion program like Calibre or a set of programs (acquire original in lit, use convertlit to make html, copy/paste into rtf, print to pdf, etc.) to make quick copies in several formats, and then bundled them together.
Conversion programs are free all over the web; if they've got an ebook in one format, it's easy to offer it in half a dozen formats. Odds are, none of those are well-made; if they auto-converted, the metadata may be wrong, or the whole thing could be in plain text (no chapter headers, no bold or italics), they might not have tables of contents, and so on. Or they might all be beautifully made and carefully structured; depends on who did the conversion and how much effort they cared to put into it.
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