Probably a coincidence, but you want to recreate the image file https://forums.unraid.net/topic/57181-docker-faq/#comment-564309
Also, I'd hazard a guess that you've been having problem with the image filling up (this may have caused the problem), as your current set value for the size is 100G, but it used to be 200G (and is still mounting that size).
If you've haven't managed to figure out why the image is filling up, I'd switch from using an image to instead use a folder for docker. More space efficient and you never need to worry about the sizing again