It probably does. I think Sony, Adobe, or ePub standard at one time placed a limit on the individual HTML file sizes. If the chapter didn't fit within that size limit, the publisher had to split it into two or more files. As a result, we still see some chapters split into multiple files when they probably don't need to be. Perhaps that is built into the software they use to write the books. Mostly though I suspect it is just poor publishing skills.