Normally you're so quick in responding to posters' comments, so I'm surprised that you haven't responded to this post. Can you confirm this problem, and if so, could it be fixed for the next update? It affects Bookends' interoperability with other bibliography management programs.
<title><style face="normal" font="default" size="100%">La Deffence de Du Bellay et les apologies de la langue occitane XVI</style><style face="superscript" font="default" size="100%">e-XVII</style><style face="normal" font="default" size="100%">e siècles</style></title>
What immediately follows the first superscript "e" is unfortunately being superscripted as well.