Hi @fikribatur,
I hope you are doing well today!
Please let us know if you are seeing the reCAPTCHA configured correctly on the settings.
https://wpmudev.com/docs/wpmu-dev-plugins/forminator/#recaptcha-settings
If so, I would suggest performing full plugin & theme conflict test. Please make sure you have recent backups and perform this operation on your dev/staging site if possible.
To learn more about a conflict test, please see this guide below:
https://wpmudev.com/docs/getting-started/getting-support/#conflict-test
Check out this handy flowchart of the troubleshooting process detailed above.
https://wpmudev.com/wp-content/uploads/2015/09/Support-Process-Support-Process.gif
If this did not help as well, please share an export of the form with us, so that we can check further.
You can find more info on how to export the form here : https://wpmudev.com/docs/wpmu-dev-plugins/forminator/#import-export
After exporting, please share the file contents with us using the free services such as Google Drive, https://pastebin.com or https://justpaste.it
Please always make sure to use such services to share the code and don’t post the code here directly as it will most likely be unusable.
Kind regards,
Zafer