Hello, @tim,
1. You said (Some features are not following global HTML, especially the footer.) I have checked the footer on your site there is no HTML set in it so could you please elaborate on it with an example of a screenshot/video for better reference?
You may upload the screenshots on https://imgbb.com/ and paste the links here.
I just disable these two plugins on your site and your shop page products issue was resolved. Plugins names “Breeze and WooCommerce Infinite Scroll and Ajax Pagination” here is the resulting video: https://streamable.com/8qd1hl
2. You can enable Popup feature from XStore >> Theme Settings >> Woocommerce (Shop) >> Shop >> Shop page Layout >> Product Added Notification Type >> Select/Choose Popup and Save Settings. See the image for a better reference: https://ibb.co/Dgq4Kqt
Regards 8Themes Team.