You're seeing it in Chrome on Windows, and it looks fine?
Here's a screenshot of what I'm seeing. The left is Chrome, and there's a vertical line in the hand (and many other artifacts):
I can see that your demo has the artifact in the left side image. I do not see it in my PC (GTX 1060), because it is not there in the original file.
- Chrome may reduce image compression to save cache space, especially with thumbnails that are not resized from original size for the thumb display size. Perhaps Chrome has simply cached the image wrong (recompressed badly). Have you updated Chrome? Have you cleared the cache?
- you use some proxy server (or VPN service) which has cached that image wrong. For example, I have seen broken content/pages with F-secure Freedome and the only way to fix it was to disable Freedome, load the page, and enable Freedome again.