Forms 2.3 - "invalid-input-response" & console error

Hi, we are on Joomla 4.4.4. Forms 2.3
Got "invalid-input-response" on submit, turned off Captcha and that removed the error but the submit button still does nothing.

tried to downgrade to forms 2.1.3 and submit still not working...

getting a console error on both 2.1.3 and 2.3:
[Error] SyntaxError: JSON Parse error: Unrecognized token '

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