Thank you for taking the time to visit the Community to post your issue, although I apologize that you haven't received a response.
We will need a bit more information to be able to assist. Please take a moment to review the information here and post back with the year and version of Quicken you are currently running.
Can you please capture a screenshot of the loan terms as well as the extra principal missing from the loan?
https://community.quicken.com/discussion/7867159/faq-how-do-i-post-a-screenshot-in-the-community-from-windows
This will help me recreate the loan to see if I get the same result.
The more information you can provide regarding this issue will help the Community to better understand and assist.
Thank you,
-Quicken Tyka