I had a really weird horror. I state that I have 4 basel installations, with wp + woccommerce + wpml
By accessing the English version of the Shop (exclusively!) from MOBILE and selecting a product variable eg Vintage, Woocommerce generates the “invalid vintage value” error and does not enter the product in the cart.
At the suggestion of the WPML team I tried to disable all components except woocommerce and wpml and it doesn’t work. However, if I change the template and I switch from base to twenty-twenty, the cart works regularly.
Thanks in advance for your support.
Alex.