Is this a Codeforces glitch ???

Правка en1, от abcdqwerty12345, 2021-10-02 00:02:33

Today, just out of curiosity I saw IBaloff profile, and his rating graph looked something like this

Screenshot-2021-10-02-at-2-27-42-AM

Can anyone explain why his rating graph is looking like this. This is the first time I saw something like this. XDDDD

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en1 Английский abcdqwerty12345 2021-10-02 00:02:33 443 Initial revision (published)