QB Issue Resolution:

Your screen shot shows 4 open invoices. If they in fact are not open some how you have managed to receive a payment without applying it to the invoice. Review the customer payments and the associated invoices.

Resolution for Issue 'having issues with open balances' available: Yes (Solved).
Source: Intuit Community forum.

having issues with open balances: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for associated invoices
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Error Recovery for associated invoices [Canada]
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