Hello.

I enabled comments and recaptcha for them.

But captcha is now showing and I got this error:

My webpage is dpswalcz.pl/aktualnosci/item/9-i-piknik-rodzin-i-przyjaciol-dps#itemCommentsAnchor

Settings for reCAPTCHA version 2 and K2
Create recaptcha from www.google.com/recaptcha/admin
to create Site key and Secret key (Domain list ex: vietpublic.net; www.vietpublic.net)

K2 Parameters (Right - Top corner )
Comments tab > set Anti-spam protection select Google reCaptcha

Advanced tab set reCaptcha public key is Site key (google recaptcha)
and set reCaptcha private key is Secret key (google recaptcha)
Set Use reCAPTCHA v2 is Yes

Hello.

I did this way and still have this issue:

dpswalcz.pl/aktualnosci/item/9-i-piknik-rodzin-i-przyjaciol-dps

Did you disable Joomla!'s default captcha?