Inconsistent readings between oscilloscopes
The manual for the 'scope first image shows that you have chosen peak hold mode when acquiring samples for display on the screen:

This mode catches a short peak that might be otherwise lost between sample times. The disadvantage of this mode is that the display may be noisier, showing every little noise peak.


The second oscilloscope uses Normal mode, and those short peaks are sometimes lost and not displayed. However, the display has less noise.