Welcome to MobileRead forums.
I'm afraid that there are several ways of answering your question; a lot depends on how familiar you are with the toc.ncx file which is part of every ePub package - and perhaps mobi for all I know.
I could show you an example of the toc.ncx files from one of my ebooks and show you the numbers which have to be the same. But if you are not familiar with a toc.ncx file it will probably mean nothing to you.
And in any event only Smashwords could tell you why their meatgrinder has put the wrong numbers there.
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