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It has something to do with reCaptcha. Removing that and changing to the boxed captcha eliminates the problem.
Good to see you found a solution to this, reCaptcha and Captcha both have the same functionality. I haven't been able to replicate the problem with your form directly or with a clone. But if it is happening accross all browsers it could very well be the reCaptcha. I will repost if I do make any new findings on your issue, or my colleagues will also if they have a solution to this. Thanks for using JotForm.