Someone got 2973 Rank in March Cook-off Div 2 (2018) this means that he hasn’t solved even a single problem in March Cook-off 2018 and his rating goes up by +201 points …After solving 2 problems and Rank 887 still, my rating goes up by +81 points. Why ??
Image Link : https://ibb.co/dKKFun
I’m guessing you are asking about this user. You can see from the submissions page here that he has actually solved 3 questions. It is most likely a case of plagiarism, hence submissions have been removed. Sadly there are a lot such cases where the ratings haven’t really reflected changes.
It is best to focus on learning + solving more problems 
Agree completely
Actually , I thought that may be it is a rating related issue…
hahaha . I also got increased my rating in that contest . Don’t know when will the rating of Insomnia 2018 be updated.