Flight School Altitude

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Altitude bug in training session

I have a bug upon starting a training session in Sedona. Although the airfield is at 4830 feet, my altimeter starts out around 3000 feet, but then goes up (as if I was ascending) even though teh plan is perfectly still on the run way. The issue is also there when the training session starts in the air (altitude starts too low, but then goes up, even in level flight. Makes it quite difficult to maintain the correct altitude in the session.