Hey @xxavier,
Can you go to WordPress Dashboard > Settings > General and ensure both the WordPress Address (URL) and Site Address (URL) are set to HTTPS and then click Save Changes.
Many thanks, hope you are having a great night!
Thats it! Thanks for the Support!
I have a similiar Problem, JQMIGRATE shows me this:
Mixed Content: The page at ‘https://www.pg-designs.at/’ was loaded over HTTPS, but requested an insecure image ‘http://www.pg-designs.at/wp-content/uploads/sb-instagram-feed-images/_pg_designs_youtube_.jpg’. This content should also be served over HTTPS.
Thats one of 7 and always from instagram. Maybe u can help me too. Thanks!