Good day, @ccraig-stemania.

To get this issue sorted out, we can try accessing your QuickBooks using a private window. This is to help determine if your browser cache can be the reason behind this behavior.

You may use either of the following shortcut keys:

• Google Chrome, press CTRL  + Shift + N
• Mozilla Firefox: press CTRL  + Shift + P
• Internet Explorer: press CTRL  + Shift + P
• Safari: press Command + Shift + N

From there, you may exclude those duplicate transactions again.

If it works fine, you can go back to your previous browser and clear the cache. Sometimes the cache becomes corrupted with older data, which can affect views and performance in QBO. This article will walk you through the steps: How do I clear my browser cache and temporary Internet files? 

You can also see this link about categorizing your bank transactions in QBO for reference: Assign, categorize, edit, and add your downloaded banking transactions.

I'd also like to know what is the specific financial are you working with? Any further details are much appreciated, so I can check if there's an ongoing investigation with your bank.

I'll be right here to assist you if you need anything else. Just leave a reply below, and I'll get back to you. Take care!