3D print bed calibration

I was having an issue with print so I decided to redo the bed calibration. I used auto calibrate to start(5 x 5). When the printer head got to the back of Y axis, the head pushes the plate down, then lifts up a bit, takes the measurement and then risers to move to the next spot and the bed rises. This happens on all points along the X axis. I have a video that shows what’s happening. My question is, why is this happening. I don’t know if it’s been doing it since I got the machine or something new. Any help will be appreciated. Thank you.

Check steps 5 and 6 in this FAQ