text: Title: leaderboard is showing negative values for f1 metric
  Body: when i run fit on tabular binary classification dataset
  i get the following leader board
  ![image](https://user-images.githubusercontent.com/101978729/198283721-88e00d9e-ecc7-4c3a-8e8d-5aa0bfb0dded.png)
  
  when i run model.report() it looks better , where the metrics are positive:
  
  ![image](https://user-images.githubusercontent.com/101978729/198284579-4333b77d-d55c-490d-99a7-70406ec61337.png)
  
  