Seems a new bug that appeared today.
Download any SGF from OGS with at least one player rated 1kyu or lower.
Look at the kyu player’s rating in the SGF.
It seems there’s a drop of at least ‘10k’ or ‘20k’, in the SGF file.
Example: ‘1k’ becomes ‘29k’, or ‘4k’ becomes ‘26k’, in the SGF.
The bot’s 1k became 29k; the human 6k became 24k.