Now I have a strange problem: after Codeforces Round #782 (Div. 2), the rating change of the last contest (Educational Codeforces Round 126) changed. And my rating before this contest turned to 2101 (it was 2099 before). According to the rules, this contest should be unrated for me. How can I solve this problem? What should I do next?
I recommend to keep it because you just got -8 but getting the rarest rating change in cf.
Nothing much can be done, it seems. Recalibrating ratings for an older contest can't retroactively rate/unrate people in later contests, it'd cause a lot of problems if they can
That's the unluckiest thing I've ever seen. At least your max is Master now
It's never a big deal. I believe that you'll back to Master and make it higher soon. Btw, having such a strange rating change is also kind of interesting, isn't it?
If you aren't stable master right now then you will come back down to div 2 and everything will be fine again.