Thank you (again) for your report
The bug has been forwarded to the developers at HackThisSite, but it`s unknown when it`s really fixed and pushed to the live version.
As a temporary solution i have hardcoded the value of 104 challenges in the score script.
Happy Challenging!
PS: I hope wechall will have some updates again soon ;P
Edit: The real challengecount is 102, because 2 IRC challs are offline. Of course the +28 challs are positive for the scores on HTS.