I can see that you are rewritting to a specific page and I think that your problem is that WordPress inserts the canonial meta tag in the <head> of the HTML automatically for all core post types (post, pages, …). This meta tag will be pointing to the original page, because you are really in the page ‘flipbook’. Maybe facebook is taking the information from the canonial meta tag as Google and the other big search engine will do.
Can you check the canonical meta tag of your pages?
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