I'd be happy to lend a hand with this. Can you please confirm which currency you have setup under Settings > General > Store currency? As well, please share a link to your store so I can have a look. Cheers!
The currency of your stores is the one which you have to set up on your page of admin on the General settings sections. In this article, you will be shown how to convert the currency of your Shopify store.
Hope it will help you!