The reason why there's a currency difference is because the wholesaler and payment processor we use to deliver our product, ClickBank, have to add tax onto certain transactions.
This is from their website: https://accounts.clickbank.com/accounting.html
SALES TAX: As the retailer of record, ClickBank is responsible for collecting and remitting tax on sales to end customers. These taxes are assessed based on the location of the end customer and the laws of the jurisdiction in which they reside.
VAT TAX: Under European and New Zealand laws, ClickBank is required to collect and remit Value Added Tax (VAT) on sales of electronic services and electronic intangible products. ClickBank currently collects and remits VAT on sales to customers in EU Member States, Norway, Iceland and New Zealand.
What a pain, I know. But these are the Internet laws we must follow.
Hoping that helps.