The https:// on all those stylesheets and scripts is likely coming from WP directly assuming you’ve set the site url in the Settings menu to have https://. Normally, a theme or plugin that adds stylesheets and scripts does that via a call to the WP core API, and that is where the https:// is added. That would not rely on the plugin. The problem usually comes from old links to the media library or other content that would have originally had http:// when inserted into the content. Those are the sorts of links that need fixing.
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