This happened to me too.  My workaround is to download the credit card charges to an Excel worksheet (comma separated) from my bank's website.  Then I fix the Excel worksheet by putting a minus sign in front of every amount that is a charge (expense).  I then upload the Excel worksheet to my credit card account in Quickbooks online.  I also had to go through and delete all of the credit card credit entries that were uploaded originally when quickbooks connected to my credit card online.  Such a nuisance!  Quickbooks really needs to figure out how to fix this.  (By the way, I spent an hour on the phone with QBO support, and got nowhere and did several searches and watched several videos before I figured out the workaround on my own.)  I would love to hear about any easier solution that someone comes up with.