why the NOV '14 ratings are down for every user?
same question hereā¦
Because of False Positive Cases 
Thank you @admin and Team CodeChef!
[ Got the problems restored in my account ]

We all cheated! By participating in the contest! 
āBecause of False Positive Casesā
Yes, keep repeating the mantra instead of thinking logically. Thereās no way everyone would get marked false positive, and thereās little way ratings would be restored to before the contest. Itās much more likely to be a side effect of rating calculations going on.
Rating Calculations already done. And they had to re-calculate the ratings because of false positive cases. Since the ratings are relative so they had to be calculated for everyone 
And what, finding the same false positives again? Btw, the ratings are at last monthās values, so you need to find something better than your word to convince me that the calculationās already done.
Also, I donāt believe identifying false positives would take less than an hour, when it usually takes weeks.
And even if you did explain the ādownā part, you still havenāt explained the āfor every userā part. Is everyone a false positive suddenly?
Mine hasnāt changed yet :((
Hi, if you donāt want to believe me its fine!
Still to answer your questions:
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They calculated the ratings of Nov Long Challenge within one day.
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Identifying false positives took many days, please see other discussions in the forum.
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They recalculated the ratings for everyone because of it. Ratings are relative.
If you are adamant, Iām sorry.
Oh, I see now why weāre having this pointless discussion. OP is using the long challengeās abbreviation for this cook-off!
Iām pretty sure heās talking about COOK52, not NOV14 (because short contest ratings were down), and thatās what Iām talking about, too (again, because short contest ratings were down). You just think this is about the long challenge.