I have found no reason why that double entry should exist.
The repair file was for an issue with the annual hall of fame which looks good in your screenshot.
The double entry is identical and looks like the function to produce it has run twice. Right now I would suggest to check with phpMyAdmin in the table phpbb_mot_sudoku_fame_month whether there are really two identical rows for January 2025 and delete one of them and then we see what happens in March.