Hi,
I think this comes from the Stripe payment plugin you're using. I think it is adding its own credit card form to this area. And It's probably not its own credit card form but Stripe's. Now, I'm sure something could be done in the plugin or with custom CSS to restrict that area's width so that it doesn't stretch that much (for example, using the max-width CSS command).
I would recommend reporting the issue to the developer of this Stripe payment plugin.
Supposing you're using this one (
www.hikashop.com/marketplace/product/133...nect-by-obsidev.html
), then I would recommend sending an email to This email address is being protected from spambots. You need JavaScript enabled to view it. so that the developer of the plugin can answer you.