The form is not working wpcf7_unit_tag_not_found

Where can we see the website in question?

@takayukister

Here is a link to the website, there are forms in buttons below, and it only submits the first time. If you try to submit a second or third time, it gives an error.

Screenshots for the form
https://i.imgur.com/2QS1PZQ.png

https://i.imgur.com/mtuIg5F.png

Try submitting the form several times; it submits fine the first time, but doesn’t want to on the second or third attempt.

What other plugins and theme do you use on the site?

@takayukister
I use these plugins (see screenshot). I tried turning them off, but the error still persists.

Try switching to the default theme, deactivating all plugins excluding Contact Form 7, Akismet Anti-spam and Yoast SEO, and clearing all cache data.

Why you are advised to deactivate plugins and switch to the default theme.

@takayukister

I can only check it on a clean theme and without plugins tomorrow, as the website is in production, and it’s not that simple to do. I have a question: could the problem be caused by the fact that I am displaying the same form using a shortcode in different places on the main page?

No, it’s unlikely to be relevant.