Hi,
I have the same error (2 forms on the same website).
It happened, I suppose, after having installed ReCaptcha > Google.
I turned off or uninstalled the Captacha plug-in, but the problem remains.
Do you want to have a look to the website ?
(With Private Message if it is OK for you ).
Thank you in advance.`
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This reply was modified 4 years, 4 months ago by nooswp. Reason: Added a line of explanation (3rd one)