why i have the other currency in the tax rule,

-- url of the page with the problem -- : www.reachaccessories.com
-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.4

Hello,
it been a while,
the question today is why i have the other currency in the tax rule, even when i only enable USD,
please take a look screenshot, thanks

Hi,

Go in the menu System>Currencies and make sure that you only have your own currency enabled there.
Then, go in the HikaShop configuration and make sure that the "main currency" setting is set to your own currency.
Then, you'll only see your own currency.