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Sigil, Calibre and Itunes probably look for the <meta name="cover" ...> tag. This tag is out of the spec, actually, covers are out of the spec, meaning there is no standard way to set them, and each software looks for different things. This <meta> tag is a sort of de-facto semi-standard, though.
I believe ADE just ignores this and reads the first page of the book. In the title page you have shown there is no image, just an epty page, and that's what ADE shows.
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