In the eScope screen capture image attached (Top MSO64B_Max_Min_Reliability.jpg): the Maximum and Minimum badge values report 268.1 mV and -272.0 mV respectively.
But just from eyeball measurement the Maximum and Minimum values should be around 2.7 V and -2.7 V respectively.

After turning off the scope, and restarting. The readings seem correct as seen in this image: Bottom MSO64B_Max_Min_Reliability.
I see there is a new firmware verison, so I will upgrade. But perhaps you folks could like into what makes these readings unreliable.

Is my scope flaky or is this a bug in scope firmware?

Scope credentials
 Manufacturer Description   Tektronix Oscilloscope MSO64B C031954
  Firmware Version   2.8.1.1496