Sorry, I can't help you, but I've seen this behavior as well, and it drives me crazy. When I look at the code for the links, I can't see any difference in their structure. I haven't really tried to track this down, so I have not (for example) deleted and reloaded the book to see if the behavior happens at the same place each time, or reloaded and skipped directly to a chapter past where the problem first started. Anyway, I too would like to know what's going on and fix it, if possible.
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