1-2:
The problem was plugin “Insert headers & footers” and removing it erased these two problems. However, since I need some mailchimp code in my header, I tried installing another plugin (“Head, Footer and Post Injections”) and it didn’t cause problems UNTIL I added the mailchimp code. Then the problems 1-2 reappeared.
Is my only solution now to add the mailchimp script (see private content) directly to my child theme header.php?