1) please foegt about default payment metho in checkout i sort that out
2) i noted that the error comes out when a destination (country) in alternative shipping address is not set – once set country destination in different shipping address the error disappears

Sorry you probably visit the site outside working hours and i usually put the site in maintance mode outside those hours .. anyhow now is accessible … vers. woocommerce is 4.8.0 – theme vers is 7.2.1 – WP admin access for you is :
just to let you know after upgrade theme to 7.2.1 now also FF have same Safari and chrome error in checkout page … (screenshot still: http://prntscr.com/vzme5q)
once we are here please can you let me know hot to set Paypal as default payment instead of bank transfer (Bonifico bancario) tnx

thank you!

no sorry i checked with a friend ipad and is working ok .. probably is my ipad that i a bit old