The amount of the discount changes after ogin

Hi, I have a problem with the plugin:
If I purchase the following product

http://www.renovatioskate.com/top-fan


and then I apply the following discount code

sconto50

the discount amount is correct € (59,90)

If I do then login with this data


davidemarchiorato@tiscali.it
cHLH2HJ2

the amount is changed (-29,98) and is no longer correct. May depend on what?

Hello,

I see you are using a one page checkout. There was an issue with opc that was fixed in 2.3.6. So if you are using 2.3.4 or 2.3.5 then please update and I believe the strange behavior will go away after that.