Go to File>Branch Setup>Equipment. Use the arrow keys to move back to December 2013.  Look to see what the M Monthly says next to it.  If it says Monthly Jan then you are billing in advance.  If it says Monthly December you are billing in arrears.  To fix this, click on modify on the branch setup.  Click on the box that says “Clear All Unbilled Cycles”.  If you are billing  Ahead click on Create Standard Months Billed Ahead, if you are billing in Arrears then click on Create Standard Months Billed in Arrears.    Then click save.  This should solve the problem.