It's because rental companies have different prices for different points of sale. Rentals for Europeans typically include insurance in the price, whereas US residents are not eligible for insurance-inclusive rates. If you are an EU resident, then you should book via the Hertz EU site. If you are a US resident, this rate is not valid for you and will likely be denied at the rental counter.

Regardless of which rate you book, you should track it for price drops with AutoSlash using the link below after booking, as rates often drop as the pickup date approaches, and this can be an opportunity to rebook and save money.

Safe travels!