Disappearing Likes On Half My Images -resolved

I've only been here about 2 months and slowly uploading images to the site. In an effort to try and see which images I should be marketing I had created a spreadsheet with how many comments, likes and favorites each image had. This was to help me see which images I should market more as most people seem to react to them more. I also take note of where I have posted them for social networking etc., I also really was interested in the amount of LIKES especially since apparently they help bring you up in the search.

Well, I noticed today that half of my images no longer have the Likes that were given to them. The comments and Faves had not changed. I do not have many images yet, but out of the 99 that I do have, 54 have lost ALL their LIKES. Since I haven't been here a long time, most don't have that many, but still - losing 200 likes on my works (and even perhaps more because I remember from a few days taking likes away in my spread sheet because I thought someone had unliked them but when I saw today that certain well-liked items that had 9 and 13 or 7 etc., likes were down to zero, I took a better look. None of my illustrations have lost their likes, only photographs.

Has this happened to any of you? Is it normal that they reset at some point? Is it something I could have done? And is there anything to fix it as how can I prove that
I had them in the first place?