Form does not expand with Quix

Hi!

Can you see why the form does not expend here:

https://www.weidehuhn.at/#bestellen

It is expending when using the "Test" menu entry. But not as it used to do it under Quix.

difference to before is that this is Joomla 4 and before we had Joomla 3.
thanks
Micha

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