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Under MC4WP > Form > Settings, do you see any setting related to recaptcha? If so, can you turn off the recaptcha there and test again?
If you want to add a captcha, I recommend the hcaptcha plugin, it has an integration with the MC4WP plugin and is free. You do need a free hcaptcha account to get an API key.
Hope that helps. If you have any questions, please let me know!