Hello,

1. You need to update cart after changing quantity http://prntscr.com/jyqnsb

2. “Title too small” Please provide the page URL

3. Shipping and Delivery – navigate to the Theme Settings > Product page > Tabs and change the title there.

4. Not clrear what do you mean “I have 2 button styles (same as above image)” please provide more details.

Best Regards