It's because the image is inserted into it's own html file (you mentioned seeing this in Sigil). Each html flow will have page breaks around it. I see this sort of thing when someone converts the file using Calibre - Calibre's default settings insert page breaks before <h1> and <h2> tags, and then Calibre splits the file on page breaks. This is separate from the Chapter detection settings. You mentioned using Calibre at some point, so I suspect you may be doing some conversion for some reason. You need to tell Calibre not to insert page breaks at those points before you use it for conversion.
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