I'd recommend moving this to the ePub forum - they have all kinds of smart people over there that can help you figure out what's wrong with your ePub (not Marvin).
My thought is that Marvin follows the ePub standard more strictly than does iBooks/Google Play; the <a> tag requires an alt="" and I have never seen the data-tegid= before.
Try:
<a alt="" href="../../feed_12/article_0/index_u82.html">are up 5%</a>
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