Join dataframes update

server.py

@@ -194,8 +194,6 @@ class LeaderboardServer:
             category: self._get_leaderboard(category=category)
             for category in [self.TASKS_CATEGORY_OVERALL] + sorted(self.TASKS_CATEGORIES)
         }
-        with self.var_lock.rw:
-            self.leaderboard_dataframes = leaderboard_dataframes
         
         with self.var_lock.ro:
             submission_ids = self.submission_ids
@@ -209,6 +207,7 @@ class LeaderboardServer:
         }
         
         with self.var_lock.rw:
+            self.leaderboard_dataframes = leaderboard_dataframes
             self.tournament_dataframes = tournament_dataframes
 
     def load_tournament_results(self):