THE_REDIRECT_URL?chronoform=basic&event=submit

Hello,

I am new to using Chronofroms 6 and SEF on the following page:
I have set an event handler and entered the redirect URL https://www.iberische-pferde.de.
. I am currently trying to add a simple form to this page: https://www.iberische-pferde.de/kontakt
When I click the submit button on the form, a redirect is automatically carried out, but the url is not accepted.
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I get the following URL: https://www.iberische-pferde.de/THE_REDIRECT_URL?chronoform=basic&event=submit

I have set an event handler and entered the redirect URL https://www.iberische-pferde.de/kontakt.

Any help would be great
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Reards