Reconciliation

Hello. I'm new to the soft. While doing some tests, noticed the following issue. If the balance on the bank account is positive, reconciliation works fine, pretty much straight forward. However, if the balance on the account is negative the it does not reconcile properly. May be I am doing something wrong? But opening balance on the account is 0.00. Add expense let's say 5.00. Bank account balance supposed to be -5.00 overdrawn.
But ones entering this amount it gives me the difference -10.00
Am I doing something wrong? Thanks