No emails are sent when the form is reloaded

Dear team Krisi,
I have noticed on several websites with Enfold that after the first sending of a message and a soft reload of the page, the Enfold form does not send any further emails. There is no error display, so that he has to assume that his 2nd message has been sent.
When sending a message for the first time, changing pages or doing a hard refresh, everything works as expected.

It rarely happens that a user reloads the page after sending a message and wants to send a second message, but with one website it has been proven that messages (orders) are lost again and again, which is very annoying.

If the math captcha is activated, it gets even stranger to send a 2nd message, because the correct result is marked as wrong and the message cannot be sent. At least this prevents it from looking like the message has been sent, but it easily drives the user crazy, since a calculation like 3 + 2 = 5 is displayed as incorrect.

Is there a solution to this problem? I think it affects all Enfold contact forms in general as the WP-, Enfold- and php-versions were different on the websites tested. Plugins were disabled or different.
This old post also shows that it doesn’t seem to be a completely new problem: https://kriesi.at/support/topic/form-refresh-the-page-on-submit
I don’t like the solution to forward to a thank-you-page on all contact forms.

Thanks in advantage
Lena