New Oven - Bad Pavlova
Your new oven might be off in temperature calibration. 

Or your old oven might have been off in temperature calibration, but you were used to it - so you set the new oven where you set the old oven, and even if the new oven temperature is correct as set, it's not what the old one was when set there.

If there are other differences between the ovens (fuel source, convection fan or lack thereof, etc.) those may also play a role.