Hiya fei113;
Seems like GPI keeps on hitting a cached version of the (home-)page, which seems not to have the optimized CSS/JS. That being said, you could use the "inline all CSS"-option to make sure the autoptimized CSS is not considered render-blocking.
Next to that there are a number of reco's in there which AO won't solve. At first sight, I'd advice you to;
* compress images better
* install a page caching solution (wp super cache or something similar)
* consider removing one or both external fonts (even though it's google fonts, pagespeed insight still does not like them)
* consider cutting down on external services used (facebook, youtube, shareaholic, google+, ...), which do impact performance & your pagespeed score
hope this helps,
frank