The primary reason behind duplicate expenses in QuickBooks is that the user must have recorded the entries twice. This generally happens when two employees under the same organization mistakenly enter the same expenses individually. The first step of yours should be to check if there are any duplicate expenses in QuickBooks account. Hence to check, open the QuickBooks software in the Chrome browser and sign in to your QuickBooks account and run the report to ensure if there is any duplicate. If nothing is found then it is recommended to update the QB Software or you can uninstall and reinstall the software.