Mixed Content Security Error with HTTPS Site

I switched my site from HTTP to HTTPS. I also changed WordPress Address and Site Address in the WordPress settings. So far, everything works fine.

Except this plugin still embeds content to a non-https link. Like http://www.linksalpha.com/social?blog=…

This causes browsers to flag the site as insecure. “Parts of this page are not secure” if Firefox and “This request has been blocked; the content must be served over HTTPS” in Chrome.

Do I need to change a setting somewhere? What am I missing?

My site is

Regards.

https://ww.wp.xz.cn/plugins/1-click-retweetsharelike/