The price at checkout is not what the calendar quoted

The rental fee and the deposit are combined into the price that reaches the cart, so the checkout figure is legitimately higher than the hire fee alone. Two other things change the number: choosing more than one unit multiplies both the rental fee and the deposit, and longer hires can cross into weekly or monthly rates where those are cheaper than the daily rate multiplied out. If the quote and the checkout still disagree, check the dates in the cart line rather than the ones on screen, since changing dates after adding to cart requires re-adding the item.