Hello,
1) Fixed. We added fix in xstore/templates/navigation-prev-next.php on line 98. It will be included in the next theme update. 2) It works the same even with the default theme https://gyazo.com/1be61954b3dd71614124800d41aa2b41 So, contact WPML support to find out how to make correct redirect there https://wpml.org/documentation/getting-started-guide/translating-wordpress-login-and-registration-pages/?utm_source=plugin&utm_medium=gui&utm_campaign=wpmlcore 3) Check now. I added custom code to child theme style.css.
Regards
