I just ran the scope for about an hour to make sure it was warmed up fully then ran the auto calibration again, no change. As for the probes at this point I think I have tried every probe on every channel trying to debug this and all 4 probes work in channels 1-3 and all 4 show the distorted waveform in channel 4. For the math function suggestion that had been one of my 1st thoughts when i saw the issue, that maybe I had changed some software setting or mode without realizing it, so I had done a full factory reset on the scope to no avail. Ok, I will reach out to tequipment.net about getting the scope RMAed. Thank you for the suggestions everyone!