Pixhawk Altitude Fluctuations with video

Hi Folks,

I have a Pixhawk running Plane 3.7.1 in an E-Flite Apprentice S. With the plane sitting on the bench indoors the altitude is fluctuating quite alot.

Is this normal? I haven’t seen anyone elses Mission planner screen while their plane / copter is on the ground sitting still so I’m not sure if this is the norm.

I have included a video - https://www.youtube.com/watch?v=wYyOkCMGYMc

What should I be looking for as to a cause? Are there any logs I can upload for you guys to look at?