I have the exact same problem.  Deleting Memorized Transactions did not work for us.

@Thompson 

Have you run the Verify/Rebuild Data utility? Any error message?

It's not the experience we want you to have when converting your QuickBooks Desktop (QBDT) Mac backup files to Windows, Thompson.  

Before we proceed, did you encounter any error messages during the process? Knowing this will help us provide you with a more tailored resolution for your concern.

In the meantime, please ensure to follow the process of converting your QBDT Mac files to QBDT for Windows, especially during Step 3 of the article, which prompts you to verify your file details before proceeding with the backup process.

However, if the issue persists even after performing the process above, we recommend reaching out to our Live Support team. They can securely access your account and provide real-time assistance through screen sharing to resolve your concern.

If you have any further questions or require additional assistance, please add a comment below.

Try removing any special characters from your memo lines.  I read somewhere that might throw an error in addition to memorized transactions.  Good luck!