Look down the drinks list and four of them show a range instead of a single number. That is not indecision, and it is not a website bug.
The option decides
Those lines carry more than one option in the account — a size, or a preparation — and each option has its own price. The register charges for the one you pick. The page shows both ends of the range because showing only the low number would be the cheaper-looking lie, and showing only the high one would cost us the order.
Why not just publish the low price
Because you would find out at the register, and that is the worst possible moment to learn a number. A menu that is right is worth more than a menu that flatters.
Tax is on top
Every price on the page is before tax. Chicago sales tax is added at checkout, online and at the counter, the same either way.
The prices here are read from the same account the register uses, so when one changes, this page changes with it.