Could someone explain this to me? I'm trying to make a $2 purchase on Steam to try out Bitcoin on the platform. But when I scan the QR code with my Mycelium wallet, It's charging me $1.32 or something extra? Why? That's over 50{88c91daedd271a990a10650c05d769cae2765e0603edf30ca95f18704e5748e8} of my purchase.