ebooks made with Sigil opening at different places when opened on Kindle

A friend of mine downloaded my ebook Man of God and wrote me the attachment.

So I started testing my other three books by downloading the mobis from KDP and sideloading them to my Kindle. (I can't buy them any more.)

The Man of God book opened near the very end. The other three opened in the middle of the TOC, which is near the very front.

Most ebooks I buy on Kindle open at Chapter One. How can I set that up in Sigil so that happens with mine?

Thanks.

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