Anything that includes support is essentially split into two products when it comes to your statement. So you’re not getting charged twice, you’re just getting charged once for the item part of the sale and once for the support part of the sale.
You’d only get $7.50 if there was no withholding tax, so if you used to have 0% withhodling tax and now you don’t… that means either:
- You filled out a W8 form and that form has now expired (they need updating every two/three years - you would have been told though)
- The withholding rate for your country has changed (rare but can happen)
- You filled out a W8 (without a valid tax ID number, or a valid tax ID number that doesn’t afford a reduction in withholding tax) and previous $7.50 sales were for non-US sales and this was a US sale (most likely)