How to remove wrong entries in Credit card register?

I hope you're having a nice day so far, @ffalkner.

I can help you delete these duplicates. 

If the transactions are still showing in the For Review tab: 

1. In the left navigation tab, click on Banking.
2. In the For Review tab, select the duplicate transactions. 
3. Click on Batch actions and select Exclude Selected. 
4. In the Excluded tab, check the boxes for these duplicates.
5. Click on Batch actions and select Delete.

If these duplicates are already accepted/matched, here's what you'll do:

1. In the left navigation tab, click on Banking.
2. In the In QuickBooks tab, select the duplicate transactions. 
3. Click on Undo.
4. In the For Review tab, select the duplicate transactions. 
5. In the Excluded tab, check the boxes for these duplicates.
6. Click on Batch actions and select Delete.

Then, you're good to go. Let me know if you need anything else, I'm only a post away! Take care.