I suspect this is a website glitch. Bring your email if you are concerned, but this is not a problem that is being reported regularly. I don't expect you will have a problem.

Do watch for extra charges added on during/after your rental. That is a problem, commonly with fuel charges, GPS charges when being "given" an upgrade, and occasionally unauthorized insurance charges.

But rates are almost always exactly as quoted, or even a little less, because the website usually over-estimates taxes.