Default product options is displayed as not set

Hello Balbooa Team,
I have a problem with the E-Commerce / Shop Module.
Whenever i want to a add a product to my card a pop-up field is displayed with the message that i need to choose an option on a fild which has an default value set in the product options.
This happens on every product on the website.

I don't know since when exactly this error is occuring but there have been no significant changes from my side since the last time i checked and it worked just fine.

You can check it yourself on the side www.farbe-direkt.at
It seems that the default value is not set anymore, but in the product options everything is still the same and default values are set.

Thank you for your help,
Best regards
Dominique

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