We need to replicate this issue on a fresh WordPress installation. Then I'll be able to escalate it to our compatibility team. You can access it through this link:
hidden link
With this link, you'll be directly logged in.
I already installed WPML and its add-ons on this site. And Also the Gravity Forms plugin.
Could you please install any third-party plugins you are using to add coupons with Gravity Forms and see if the issue is replicable on a clean WordPress installation?
Please configures WPML and Gravity Forms as set on your site (just the basic configurations needed to replicate the issue are enough). Please also ensure you install the latest version of the plugins.
Please let us know when everything is finished, and you can replicate the problem.