Why Codechef rating decreased?

I submitted only one problem in the last June Challenge which was correct, but suddenly today i saw … my rating has decreased…whts the reason behind this?

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rating ~ rank

the lower you rank, the more your rating will decrease.
the higher you rank, the more will it increase.
It’s all about what rank you acquire in a contest.

Rating not only depends on solving the problem but also depends on how fast you have solved it. If you participated in a contest and failed to solve any problem you will lose points.