I looked in 2 puzzles with a small amount of shown solvers
i guess it is the number of solvers with the most used language
e.g. 'dominoes solver' shows solved by 5 and has 14 solution
5 of this solutions are in python3 and it is the language most used ...
'musical-intervals/solution' shows solved by 5 and has 16 solutions
most used language is c++ with 5 people ...
maybe you got a bad join on the database?