I have the same problem. Image optimization mixed images. For example:
I have original image cat.jpg of cat and image dog.jpg of dog. Image optimization mixed images. Took image cat.jpg of cat and returns image of dog in various sizes, but all like cat-100×100.jpg, cat-150×150.jpg, etc
This is completed disaster. And is definitely fault of image optimization service. Original which are named something.bk,jpg and optimized image something.jpg have different content. Luckily I still have image backups.
I wonder who will clean this mess.
