The administration can decide to permit or disable currency and language auto-change characteristics. Also, change the default retailer currency and language from the module management page. If the module does not obtain suitable currency and language According to visitors' spot then default currency and language might be used. The module https://www.presta-addons-modules.com/en/front-office/prestashop-currency-language-by-locations-geoip-auto-redirect.html