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I can't seem to replicate the glitch on Stripe. I integrated stripe with my form and my Stripe account was connected successfully.
Can you please try removing the Stripe payment field from your form and adding it again? Furthermore, please sign out of Stripe before connecting it in the form. You can sign in once you have been prompted in the pop-up page.
I also cloned your form and tried to submit it. I was able to submit the form without any issues with the submit button. Please try clearing your form cache and your browser cache. If the issue persists, please let us know.