Why is my rank altered in the last contest?

my rank is altered in the last contest for reasons unknown , it happened in the past too but there wasnt any action taken and it showed plag and cheated for me , but my answers are my own submitted after running on sublime and i can explain all of them , if it shows plag this time i need an answer atleast!!!

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Additional info

Before dropping your ratings, you will get an email, you can reply there to get it corrected, if you have not cheated.

I did not receive any mail yet , they didn’t send any mail last time too , now all my last contest submissions don’t appear and my rank is also lost