Old values are transmitted | WordPress.org

Hello,
I hope I can explain my problem well.
I have set up a product form on this page:

https://www.kd-ueberdachung.de/test-angebot-anfragen-50/

Everything works fine, but if I select something for a product and then decide to take another product and select everything here and submit it, I am also sent the value that I selected for the first product.

Is there any way to set that only the values that are currently visible through the group classes are transmitted?

Thank you very much!

The page I need help with: [log in to see the link]