bug input validation

You can see the error on the demo site https://wpdemo.net/demos/plugins/contact-form-7 or https://wp-tinymce.art-plus-test.ru/

When you select a checkbox, input validation is triggered. https://postimg.cc/TKFwk0bb

Do you really understand my question?

Have you seen this behavior somewhere on other sites?
If this is not an error, why does validation of inputs only work if they are above the checkboxes. And if they are below the checkboxes, then it doesn’t work.
Why only for input, but not for selects, for example?
This is a rhetorical question.

Validation triggered when a checkbox is selected – this is not normal! This is a bug!
Validation should be triggered when the submit button is clicked! – This is fine.
And if you take your plugin from earlier versions, this bug is not there. This has appeared in new versions.