Where a Checking account has a "Check #" column, credit card and other account types have a "Reference #" column which is used just like the Check #. Add this column to your registers.
If that doesn't shed light on the issue ... Can you please capture one or more images of the parts of your Quicken window showing the issue, sensitive information blacked out as necessary to protect your privacy but annotated to describe the situation, and attach the image(s) here? The Windows Snipping Tool (available with Windows 7 and up) can be used to capture a partial screen image and save it to a file. Microsoft Paint can be used to annotate the image.https://support.microsoft.com/en-us/help/13776/windows-use-snipping-tool-to-capture-screenshots To take a screenshot in Mac please see https://support.apple.com/en-us/HT201361 Please create image files of type PNG, JPG or GIF only. To attach the image here, start composing your reply in the "Type your comment" box at the bottom of this webpage. Drag and drop the image or, at the top of the text entry window you'll see a row of icons possibly beginning with B I S Click the "Attach image" icon (the one that looks like a tiny landscape with mountain and sun). It will allow you to select and upload the captured image file(s) from your computer. The captured image(s) will be inserted at wherever the cursor is located in the text.