Why the price changes at the check-out? Tax added price/ dynamic prices including taxesUpdated 11 hours ago

We activated dynamic prices including taxes of Shopify.

In countries or regions, such as the USA, shoppers expect taxes to be excluded from online shop prices and added at checkout, if applicable. When buying internationally, the Dynamic tax-inclusive pricing option provides the possibility to automatically include or exclude taxes in product prices based on the buyer's region.

Please read here more.