Fees being charged on the US Sales Tax collected by eBay

I am based in Canada and sell on eBay.ca When I sell to an American buyer, eBay collects the state sales tax. I have noticed that then eBay will charge me fees on the US sales tax collected as well even though I have nothing to do with that. That is totally unfair. Can somebody explain why eBay does this. Thanks

seller adicio2005

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and you just noticed this?

eBay has had this in place for nearly 2 years now...

eBay fees are calculated on the TOTAL transaction and that includes any applicable tax paid by the buyer...