In my case, this issue was caused by my caching plugin (W3 Total Cache). Disabling it solved the issue but you may want to keep the plugin and change the font URLs in the CSS file from HTTP to HTTPS.
I came across this issue when the Social Pug plugin stopped showing icons on the social media buttons. The root cause was the caching enabled by W3 Total Cache plugin. If you are in a similar situation, there are three ways to fix the issue:
– Disable W3 Total Cache (not recommended because your website’s performance may decrease)
– Change the font URLs of Social Pug plugin to HTTPS
– In some cases, URL Rewrite rules may cause this issue. Check your .htaccess file
Mixed Content: The page was loaded over HTTPS, but requested an insecure font
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This reply was modified 5 years, 8 months ago by bluewt.