It's strange that there are 3 teams whose scores are so different from the other teams :) I can observe that the previous competition had a team with a similar gap. I think the data leak made the competition unfair :). I think the host need to carefully review the code when the competition ends.
Can you explain kamsamita?
The top teams do something we miss - it doesn't have to be a data leak.
You are right.
However, with this size of a gap, it most certainly is.