The number of teams is kept as Treasurer information as this is important for showing all Financial information. But sometimes it isn't reset when the League is restarted.
Manually reset the Number of Teams:
-- Open Setup-> Fees-> Weekly.
-- Click on the "Estimated Budget" tab.
-- Click the "View Estimated Budget" button to show the table.
-- Enter the correct number of Teams on the table or click the "Reset" button above the table.
If the information on this table is correct, it will be correct on the application.