[Katsunami]

Some time ago I took advantage of the re-usable 75-90% codes Kobo had handed out, and bought 108 books. Now, I was looking through my credit card transactions and noticed something strange regarding one of the bills. Normally it works like this:

REPORT OF APRIL 2014
Transaction 1: €10
Transaction 2: €10
Transaction 3: €10
PAYMENT, LAST REPORT: -€78 <- This would be the total of the report of March

So, the total of a month will be billed in the month thereafter; this month, the deduction would be €78, next month it would be €30. So far so good.

Now, I see this:

PAYMENT, LAST REPORT: -€193

Deduction of €193. So, I go back one report, to the one that should add up to €193. Hey. The Kobo spree month. That wasn't €193, more like €60 or so.

*count, count, count* 108 Kobo transactions... all are €0.44 or €0.50... two other transactions... looks good. Total: €64.

Maybe I missed something.
*Scan all the lines... all amounts are like €0.45-50, except for one of about €10*
*count, count, count* -> €64

Damnation. Check all months after, and all months before.

*count, count, count* -> report adds up to X, and X was deducted the month after. Correct.
* Rinse, repeat. Count my fracking brains out *

Result: everything correct, but the Kobo month was billed for €193, while there is €64 on the report.

I'm going to take a look into this at the bank tomorrow, but is there something I could be missing; some sort of hidden fee that is not in the report but added afterward or something?

Any ideas?