It's not a weirdness. It's (IMHO) poor coding. It's not coded properly to be as backwards compatible with ePub 2 as it could be. <section> is from ePub 3 and is ignored in older versions of RMSDK. B&N is using an older version of RMSDK. To be more ePub 2 compatible, no class and no ID that's actually used should in in a <section>.
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