I’m not sure if this is what you did, but the only way I could replicate the error was to adjust the “upperarm_l” in the Base Pose in the Retarget Manager and then select “Save Pose.” I understand if you want to start fresh, but you may want to check this just in your current project just for a learning experience…
If it turns out your base pose has been altered this way, you can adjust the arm yourself or simply press the “Reset Pose” button.
