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Hmm.. I suspect that what's happening it that Amazon's tools are looking at your uploaded book and seeing that the start of reading position is right at the start of your book. And they've coded an assumption that in that case the creator has NOT set a start of reading position, and so set it to a 'sensible' value. You could test this by having a start of reading position set before the TOC but after the very first position in the book.
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