4K Setting but files say 1080

I have my Mavic Air set to record video at 4K 24fps. When I import my files to the PC they say they are 1080P. I have double checked my settings and even tried setting the drone to 108 for comparison. I can definitely tell the difference as the 4K look way better.

Any thoughts on this?

You computers graphic card does OT support 4K
Or you SD micro card does not support 4K
Even tho it shows it recording in 4K on your drone

what video player do you use?
you may find the video player resizes the 4k file to a 1080p to play it.
VLC player doesn’t do this btw.