I have changed my site for SSL Permissions where all images and site url is changed to https:/ but some default images of theme is not changed from http to https.
And that's why you need to remove them and upload once again into Media section because Wordpress is creating those links himself base on http:// or https:// protocol set.
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it's because wordpress set link during media upload. So now, you need to remove all media and upload them once again to get https:// before.