By duplicate, do you mean 100% exactly the same - with the clues listed in the exact same way? You can use the same derivatives, change one clue, and have a slightly different result - it is a different puzzle then...
I believe the names of the fastest solvers for a given puzzle are not being updated at the moment, so the fastest solver stats for a given puzzle are old. I am often getting fastest solver, but have never seen my name anywhere except in the monthly stats
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