Hello,
1), 2), 3), 4), 5) Just re-add images from your site for these blocks, because imported bg images use the xstore.8theme.com url and are blocked on your site.
B) It comes from third-party plugin that you use. Try to disable them one by one to find out which one gives the notice and contact plugin author to fix this.
C) Contact Elementor plugin about this.
D) Provide us with FTP access, please. We’ll check the issue in more detail.
Regards