If the running balance on the account ledger differs from the total at the bottom of the ledger you can reconcile the account.
Reports> Billing Statements> type last name of guarantor into the A to Z fields. Example: SMITH and SMITH or SMAAA to SMUUU to include a larger name range. Click Reconcile on bottom left, select or highlight the account to be reconciled when the list is presented. You will see the old balance and the new balance at the top of the chart as being different. Click the Reconcile button then close and check the account balance on the patient account.