In codeforces contest CodeTON Round 2, I get rank 684 so I should receive 2 TON coins. Recently I didn't log into my TON wallet. But today when I want to check whether the system has sent those TONs, I found out that my account sent out 1.95 TON to an account I don't know, which is definitely not my operation. Is this because my account was hacked by others? Does anyone have the same experience? What was the reason?

(My TON account, +2 by contest, -1.95 is not my operation.)

Upd: I changed my password yesterday but today the rest of my TONs were also gone! It was sent to the same account and this time with a comment "qwe" (can't understand).