Java scanning text file incorrectly from network drive

Question

I have an 18,000 line text file that I am scanning from a mapped network drive. I am using the scanner class in Java. When the file is stored on my local machine, my code confirms that it has 18,000 lines via a line counter variable. Using the same code, but only changing the file path of the text file to the network drive, it returns ~700 lines. Does anyone know why this might be happening? When I drag the file from network drive to C, it returns 700, but when I copy the contents and put it in a new file in C drive, it returns the true number of lines. My code is below:

public static void main(String[] args) throws FileNotFoundException
    {
        File text = new File("C:\\Users\\textfile.txt"); //returns correct number of lines
        //File text = new File("N:\\textfile.txt"); //returns incorrect number of lines
        Scanner scan = new Scanner(text);
        int linecount = 0;
        while(scan.hasNextLine())
        {
            linecount++;
            scan.nextLine();
        }
        scan.close();
        System.out.println(linecount);
    }