Smaller images than submitetd now displayed

I sell on Amazon for more than 10 years. So I know what must be inage size to be displayed correctly - enlarged when customer place mouse on it. I sell about 500 products and maybe 50 of them has "hacked?" images now. Image is same as my image, but not enlarging. Maybe 400 pixels instead of 1500. And no help when I insert large images again. I opened maybe 10 cases about this in past few months and just had to read over and over things like Show me manufactuere catalogue and these all.... Or delete item and insert again by file... I did it. But result over and over same. Nothing changed. For example B014T0U9OS

I can not believe that it would be only me, only one form Amazon experiencing this. It consumes my time and cut my sale. And NOBODY willing to help. Thanks for comments.