PhusionMedia Sharks :
It happens when there are not enough teams on level 39 to make a full championship. If the total number of teams on level 39 in the game is not divisible by 14, then there will be some teams left over who will not make up a full championship table. So they fill the table with teams from the next level up.
Other way round. They start at the top level and work down - leftover teams play in the level below.