TOPIC: SOLVED - 2.7.2b - Confirmation email picks up wrong amount

I have only one field which modifies prices.
The idea is following:
$599 - registration fee
some registrans could have discounts by checking appropriate radio or dropdown field values.

Frontend - price is calculated properly
Backend - records list - price is calculated right too
Confirmation email (so-called custom thank you message) - wrong amount is picked up by using [AMOUNT] field.
Notification email (to admin) - same wrong amount as above

Example
Reg. fee - 599
Discount - 0 (one of options)
Backend - 599 (total)
Frontend (during registration) - 599 (right)
Confirmation email - 538 (WRONG)

Guys, it should be fixed ASAP, because I cannot misinform my customers (btw. it's prohibited by law and they simply could sue me for that!)

No one else has reported an issue like that. Please submit a ticket with access to your site so we can check into it.

Done yesterday already.
Even now I am double checking everything...
Instead of Amount of 3000 just received 688 - Drama
BTW - ticket TECH-N9QPGB5IR1

Just updated to 2.7.2c (I thought for a while that this could be cache and/or session issue) - still no luck.