Hello,
Take our apologies for the delay in answering.
1. In other cases mobile panel will overlap part of the footer or copyrights. So, it disappears once you are at the very bottom of the page.
2. Because iPhone has rounded corners.
3. Check now
4. Check now.
5. Because footer copyrights areas have the 50% width. Move the copyrights to footer static block instead of using the copyrights widget area if you want to make it 100% width. Check now.
6. Check now.
Regards