Hmm. I've had a bit of trouble making custom memes on my phone over the past two weeks or so (slow progress, freezing) but not cut off image parts. I downloaded the image and it's complete on my device. Download it again and open the file with an image viewer to make sure the file is complete. Could be the file got corrupted, but that's a long shot.
If the second file is good, try making it again. If that fails, can you try using a different device or PC?