Hello,

Firstly, your provided Login details are still incorrect. It says the Username is not registered: https://snipboard.io/QMTjmt.jpg

Secondly, we have tried to add Product to Cart on your Site in both languages it was added fine there wasn’t any critical error occurred. Please see the following Video for reference in this regard:

https://www.veed.io/view/deade2cc-8f63-4712-8a5b-933388b3a1c9

Best Regards.