Hello,
1/ As I can see, you edited cart and checkout files via child theme https://gyazo.com/182573d204f40c5f0e036548b38b8598 Activate parent theme and check how pages works, or provide temporary FTP access, so we can take a closer look. Please note that we are not responsible for your custom changes.
2/ Do not post a few questions via 1 topic, please https://www.8theme.com/topic/menu-button-not-working-in-mobile/#post-296329
Regards