It seems there is something wrong with a hidden map like that. If you click “See This” and then resize your browser window, the map will show correctly. I found these threads that have similar issue: http://stackoverflow.com/questions/24513536/google-maps-display-from-hidden-area-using-twitter-bootstrap, http://stackoverflow.com/questions/4064275/how-to-deal-with-google-map-inside-of-a-hidden-div-updated-picture.
If the issue persists, please ask google map community.
Hope this helps.
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