App store billing discrepancy? Surcharges?!?

So I have not been checking my credit card billed amount since I never had issues with apple and trust the company and their attention to details.

However, today I was looking at how much I spent and got a (somewhat) nasty surprise.

I purchased from an app store that is the same country as my settings and the same currency as my credit card - Singapore. I had previously lived in Sydney and my apple Id started off being an Australia app store id , which have been changed since 3 years ago.

The invoice apple.com sends me is different from the amount I get deducted in my bank statement

Anyone have this issue before?

I would think it could be the bank / debit card at fault but i never had any issue with any type of payment, only that from apple app store, so am really confused

An item that is stated to be "SGD $44.98" appears in my bank bill as "SGD $46.24"

Any sharing or enlightening would be appreciated, Thanks