I don't know what might have caused that.
Google doesn't care if your website served via HTTPS or HTTP. it must be because of something else. Check your website through Google Webmasters Tools - www.google.com/webmasters/
and see if google failed to crawled or failed to reach to your website (make sure your website has FOLLOW rule for the ROOT in the robots.txt file). Additionally, you can ask Google to re-crawl your website through Google Webmasters dashboard.
I don't see any problem with your website. Maybe google somehow decided not to show your website for certain keywords and this can't be related to HTTPS or HTTP
Check this screenshot, your website is already on google.com
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