Hi there, @cmb1.
Allow me to join the thread and help share information about the Clr column in the Profit and Loss Detail report.
Yes, as mentioned by my colleague JanyRoseB, the transaction with the check-mark on the Clr column are those that have been cleared in the reconciliation process. It happens, especially if you have a payroll liability adjustment affecting to an expense account.
If you wish to check this further, I suggest getting in touch with our QuickBooks Support Team to access your account via a secured remote access. For the support's contact information:
Keep posted if you have other concerns about running reports in QuickBooks Desktop, I'm always here to help. Have a great day ahead!