Add to cart button not showing on variable products

Hi, im having the “add to cart button not showing on variable product” issue on my botiga theme, other themes i tested have no problem. Other product pages with “simple product” also have no problem. Is there a way i can fix this problem? I know it can be compability issue but i really want to use this theme with your plugin together. Please check the image below or the link.

The page I need help with: [log in to see the link]