Exif data not making sense

Hi all
I flew a session yesterday of a quarry.
My takeoff point was approx 80 ’ ASL.
When hovering after takeoff, I photographed the control image. The exif alt shows 86 feet.
I then climbed to 350’ according to the feedback on the controller, and flew the session at that.
All those images are showing an exif alt of 16.
Any thoughts why this is happening?

Which drone are you using? I know that the current firmware of the Mavic 2 is outputting crazy exif altitude data.

Using the Phantom 4 Pro.
Imagery stitched up well. _
I had a “lost signal” episode, and drone reduce altitude by couple hundred feet. I was looking for those images to delete out but could not find them.