downloaded video is messed up

when I play the video after cropping it in adobe express in the browser everything looks great, but once I download the video, only the first few second (about 3 I think) gets saved. the downloaded video isnt only 3 seconds long, but after 3 seconds the frame changes back to first frame, and stays like that for the remainder of the video. I attached the video before cropping and the video after cropping and once I downloaded it