I have an issue with my site's contact us form page.

I have installed Google Captcha, and it all works fine apart from that on the main page i am unable to send any messages.
The error i get is Response not set.

I have no errors in my log file that relate to google captcha or contact us form.

The version of zencart that i am using is V1.5.8a and we have the bootstrap template.
PHP version is 7.4.33

Any help would be appreciated.

Thank you