DRV8847: DRV8847S OLD operation waveform

Part Number: DRV8847

Hi,

DRV8847S is set as 2 pin interface and IN1 to IN4 is zero. So OUT1/3 output low and OUT2/4 output high. VM is 12V.

Below is the OLD operation waveform(yellow-OUT1, blue-OUT2):

Could you please help to explain the OLD operation? Why OUT1 goes up to higher than VM and OUT2 goes down to lower than zero?

Thanks!