How come plat price is alomst 23% higher than the real conversion rate?

Ehhh............

I have discovered that if you purchase Plat from a overseas country (other than in America USA) via an Apple device the cost of Platinum is cheaper than an Android device.

I think Google charges more of a cost to consumers than Apple does in this instance.

But then how come other games charge/cost exactly same what they say

Even when you are in a different country? with the currency exchange rate it has to differ?

It's like 23% higher after conversion, I mean comparison to real exchange rate outside. Anyway i'm done :D was just curious