I'm working with an array of arrays to fill a grid (with actual size CurrentGridSize) with objects. I use randoms to determine the position the objects should take in the array and thus on the grid. The current expected behavior is that there will be around (CurrentGridSize x 4) objects in the array (barring doubles). However, the actual behavior is: the amount of objects is always exactly (CurrentGridSize). And I just can't figure out why that is. Even if I execute the loop 1000 times, the behavior stays the same. Can someone help me out and point out where the problem might be?

Much thanks to whoever can solve this mystery!

for(var k=0;k<(CurrentGridSize*4);++k)
    {

	    //calculate randoms for placement on grid
	    HorIndex = (parseInt(Random.Range(0,CurrentGridSize)));
	    VertIndex = (parseInt(Random.Range(0,CurrentGridSize)));


            //if statement to prevent doubles
	    if(CompleteGrid[HorIndex][VertIndex] == 0)
	    {
            //instantiate and move to correct position
		    CompleteGrid[HorIndex][VertIndex] = Instantiate(IslandType);
		    CompleteGrid[HorIndex][VertIndex].transform.position.x = HorIndex*SquareSize;
		    CompleteGrid[HorIndex][VertIndex].transform.position.z = VertIndex*SquareSize;	
	    }
    }

EDIT I've discovered where the problem might be: if I leave out the if() statement to check if the element is zero, it does work correctly. But now I still don't know why this is the case...