Out of 3000+ questions on my website I have above 2000+ questions indexed on Google. So I would say that your website is not properly index yet, give it some more time and try to do some SEO. One Page SEO alone is sometimes not enough to get good results.
For the beginning you can also add some top question's URL in Google Webmaster manually (add here) so that more and more of your content starts to get indexed in Google. And with time Google will automatically start to index your content.
I hope this help.
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