Apple Charging me more than it should for my purchase.

Hello!

I recently bought a game package on Identity V that was around 4.99 USD. I usually buy from this service once in a while, and I've even made excellent purchases beforehand. But for some reason, this time around, my 4.99 purchase was submitted off my card as 30.81 USD. I know it says this on Cash App and PayPal, so it's not something on their end. Apple says it's charging me 4.99 before I put my fingerprint. Charges me 30.81 exactly at the time I bought it through one purchase, so it's me. How does that work? If I didn't pay it, I couldn't download anything. Mind you, it's an OPTIONAL purchase, not a subscription. I don't even have any of those active.