Angelbaby whenever I have had trouble with the images it has been with names. Like a designer uploading image called preview and then it adds it to anything else that she has called preview. I would try deleting it from your ftp then go in and add the new one through editing the product. BUT make the name something completely different from the original one you had. I can't tell from your preview cause its little but I am guessing you have several images for the collab. Start over and change the name of the main one - make it completely different. Once you change the name of the main image it will only associate previews with that name structure to the product and hopefully that will fix it.