The amount doesn't actually change, but it appears to - see what I mean:
I have a $400 discount for members on this registration so on page 1 this is what it says:
Your total Registration cost: $625.00 - $400.00 (Member Discount) = $ 225.00
After selecting some items for the event ($130 worth of items) this is what it says:
Your total Registration cost:
$ 355.00 (Member Discount)
( Event Fees = 225.00; Additional Fees = 130.00)
It looks to the registrants like their discount was reduced when it hasn't since that $355 is the amount
with the discount.
To fix this I recommend adding a new language item called "with member discount" so the line looks like this:
$ 355.00 (with $400 Member Discount)