Why doesn't the following Java code enter the if clause?

I am doing an 8-puzzle project and I have a method that checks whether two states of the puzzle are the same. I am using a two dimensional array to represent the grid. I was wondering why the following if statement is never evaluating to true. I called the method with a two dimensional array that was absolutely the same as the one called state which represents the current grid state.

public List<Node> getSuccessors()
{
   //Code that is not relevant

   int [][] nextState = move(direction);

   if (areDifferent(nextState))
   {
       System.out.println("INSIDE");
   }
}
//Checks whether two states are different
public boolean isStateDifferent(int[][] nextState)
{
    boolean different = false;

    for (int i = 0; i < state.length; i++)
    {
        for (int j = 0; j < state.length; j++)
        {
            if (state[i][j] != nextState[i][j])
            {
                different = true;
            }
        }
    }

    return different;
}