Inexplicable pricing behavior in smartphones

Hello,
I have a strange problem.
In some smartphone I visualize a price, in other a different price.
I invite you to try (try the native then Chrome or other browser that you have on your smartphone):
https://xi-store.com/milanese-sayings-c-13/sweatshirts-with-milanese-saying-c-19/sweatshirt-with-aged-logo-of-milan-p-368
the correct price is 42.90 € (Including Tax: 7.74 €) -vat is set at 22%
In desktop is never wrong. I attached 2 screenshots.
All the products.
The only relation I can find is that in some smartphone it double the VAT, Why?

OK, solved it myself. Maybe it can be helpful for somebody else:

There was a country (Austria) present in 2 geozones (an oversight on my part).
This created the strange behavior. Strange that it did not happen on the desktop.