In my profile it is written that on February 25 I lost 26 rating in horde. Although I only lost 5.
because you entered the tournament when you had 2571 and when you played you had 2550
then this is a mistake, the old rating is taken as the initial one. At the beginning of the day I had a different rating
maybe you got a refund from somebody that allegedly cheated, but the alleged cheater got unmarked 5 minutes later
