Hi. I’ve changed my mind and only want US$ for my website

I’ve set the location for us$for all locations and clicked save. But it still still shows as au$ when I log in from australia as my location. It also gets very confusing when someone from Australia clicked on the tagged product on instagram, but when it redirect to couturemeteor.com or the link above, the prices shows as AU$. To top it off, the AU in AU$ or the US in US$ somehow doesn’t show. Please help.

The page I need help with: [log in to see the link]