I don't know about the Nook android app, but Nook devices have an old bug and ignore the short-hand CSS "margin" rule ("margin: a b c d;" and friends) based on the "publisher formatting" option (I don't remember which way experiences the bug).
The work around is to convert all "margin" css rules to the equivalent margin-top, margin-right, etc. rules. Somewhere in the calibre conversion settings there is an "expand css" option (or something like that) that does this in the css during conversion. When I was reading on a NST, I had some saved regexes in Sigil that did this.
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