Liability payment not recorded correctly

Is there a problem is Manager liability payments?

When I make a payment toward a loan liability, the posted result is an increase in the amount of the loan, not a decrease.

For example I have a $10,000 loan. I record a $500 payment on the loan from my checking account. The posted result is $10,500 instead of $9,500. What is the cause?

You have the loan set up incorrectly in your chart of accounts. Post screen shots showing the Edit screen for the loan and the control account you assigned it to.