that's a weird docx file. How did you generate it? It contains empty list items instead of just a single list item starting the numbering with an offset. Word does not display those empty list items, so you get the effective appearance of a single list tiem starting numbering at the offset.
Generate your lists, normally and you should be fine. I could look into having the conversion engine detect this peculiar markup (empty list items) and special case them, but that will take a while.
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