Hello,
Re #4: This is working as intended; the original form functions in the same way as seen in the link provided: https://gyazo.com/b2b1fb68be2d5ee691a49c6b13f4d8ac
Re #2: In order to resolve the issue of the incorrect order of the “Back In Stock Notifier” appearing above the swatches on the variable product and quick off-canvas view (as seen in the link provided: https://gyazo.com/730e30754f2e2edfd0257a78632bfeb0), you will need to seek assistance from the plugin “Back In Stock Notifier For WooCommerce”.
Re #5: This has been fixed, as seen in the link provided: https://gyazo.com/86e226363daf831c0f8daa2f11bed029
Best Regards,
8Theme’s Team