I think all of the cases I have seen have been in books I have purchased. I think at least one of the ebook creation tools tends to add the fragments and anchors when they aren't strictly needed. I don't know which, just that I think it has occurred in books that have had similar looking code.
I'm pretty sure I have seen it after using the ToC generation tool in calibre. That can add an id to a heading when it isn't the first tag in the body. But, I'm not sure of the exact pattern to cause this. And if the ToC tool can do it, then a conversion could. I rarely do conversions, so I am not sure.
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