prdoduct not added in cart

hello, for no obvious reason, suddenly, a customer who adds a product in cart fails to update the cart.
https://i.imgur.com/5PVHztj.png
he/she must press the add to cart buton 2-3 times to get the cart updated and then the cart shows up product x2 or x3!
please help, it is live

Hello,

Could you please disable all plugins that are not related to our theme and provide us your admin access so we could check it?

Thank you in advance

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