There is no option for using a coupon code on our checkout

Hello!

There is no option for using a coupon code on our checkout page. I want it to be "Part of table", but it will not show when using that. I have tried to deactivate all plugins, but that doesn't help. I have a lot of custom CSS on the checkout page, but I have also tried to delete that, and doesn't do it either.
You have support access if you need it.

Please help.