Steem challenger is a project created by omeratagun, one of our supervisor; for the people who posts via utopian, dmania, dlive and many other projects which includes beneficaries to calculate rewards.
Possible rewards for posts created by users should be calculated.
Reward for resteemed posts are also calculated.
You will see that there is difference. (Rewards for resteemed posts are also calculated)
and ($author==$meme)){
should be added to the source code. I also send a pull request to fix the problem. You can find the pull request clicking here.