Usually, the issue is the reCAPTCHA field. A limitation of the reCAPTCHA service is that it is not compatible with AJAX. Gravity Forms automatically disables AJAX if a reCAPTCHA field is present to prevent problems from occurring with reCAPTCHA.
If you want to use AJAX and use a Captcha you can install the Really Simple Captcha plugin. Once you activate that plugin it will add additional options to the Captcha field in Gravity Forms.
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