previously I noticed it with another image of mine but
this image showing me same duels with decreasing image score...I submitted it on 16th October...may be I am not clear about the process..
As images get into a higher score range, they then compete with other images at higher scores. So an image that had mostly wins vs lower-scored competition may start to find that has more losses and that its score rise will flatten or its score will go down vs this stronger competition. The overwhelming majority of images do not have scores that get them to the top of the leaderboard....so a good image's early competitors are very likely to be from this pool of lower-scored images...it will win a lot and its score will rise quickly...until it gets into the elite group and face stiffer competition and the likelihood that its score will stop rising or fall as it faces more frequent losses.