When I enable reCaptcha, reCaptcha doesn't appear on the front end. Also when I visit the site on another browser and went to a post page "ReCaptcha error: grecaptcha is not defined" this message appears on top of the page. I couldn't find the answer to this in any ware on the internet. (My hosting provider is Google Cloud Platform).
We see there is the Simple Google reCAPTCHA plugin installed on your website. Please either deactivate the plugin or find a way to disable the Simple Google reCAPTCHA plugin's reCAPTCHA for the comment form.
Please check the settings and make sure the keys are set correctly. I.e. if you're using the reCAPTCHA v3 make sure the keys are generated for the v3. The same with reCAPTCHA v2.
I found the problem and It was solved.
Problem occurred because of some settings of Wpforms plugin.
Thank you for your support!
