In some situations, the likes/dislikes net change might be negative if the number of likes removed is bigger than the number of likes added. Here's more info: https://goo.gl/rnKer6
That's understandable @TeamYouTube, but in this case as seen in the image above, the number of likes is 20+ greater than the number of dislikes, so it's weird because it doesn't seem like that should occur. So, is there anyway to get the proper like/dislike ratio above back?