Hello, @Amy V,
1. Your issue is resolved now, please check back to your site after clearing the browser cache. I have Turned ON the Mobile main header sticky. See the image and watch the video for a better reference under the private content area.
2. I have checked your site now and found no issues. I have captured a video for you on your site. Please watch it completely for a better reference under the private content area.
Regards 8Themes Team.