Charge in Brawl Stars Gem Packs

I made 2 purchases of Gem packages in Brawl Stars from my Apple ID, in the app they show a cost of 4.99 and 1.99. But in my card and in my records of Apple Purchases I was charged 5.39 and 2.15 instead of the a amount shown during the purchase in Brawl Stars. Why is this happening?