I haven't seen that one. I have seen plenty of books where the chapter heading is a link back to the TOC. What it probably means is that the value for the href attribute of the a tag is wrong. It might be that if it doesn't point to a valid destination in the book that it get passed to the browser.
In any case, I don't know how to turn it off. Personally, I would fix the book, but I tend to edit them a little bit anyway, so this would just be an extra step.
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