Adding to list overwrites previous object values in C#

Although there are several posts on Stackoverflow about this kind of issue, then I have looked through them and have not found a solution for my problem.

In the code, I am going going through a list of lists with a foreach loop and adding created elements to another list. Although in the foreach loop each iteration gives an unique value, then outside of it the values are the same.

try
{
    List<Takeoff> takeoffs = new List<Takeoff>();

    List<List<String>> itemTable = queryTable("TK_ITEM", 52);

    foreach (List<String> row in itemTable)
    {
        // Second element in the constructor is Name.
        Takeoff takeoff = new Takeoff(row.ElementAt(0), row.ElementAt(3), row.ElementAt(11), 
            row.ElementAt(17), row.ElementAt(25), row.ElementAt(33), 
            row.ElementAt(37), row.ElementAt(45));

        MessageBox.Show(row.ElementAt(3)); // Each iteration gives an unique value.

        takeoffs.Add(takeoff);
    }

    // Values of both objects are the same.
    MessageBox.Show(takeoffs[0].Name);
    MessageBox.Show(takeoffs[1].Name);

    return takeoffs;
}
catch (Exception)
{
    MessageBox.Show("No material takeoff created!", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);

    return null;
}

I have tried various methods of adding and displaying the values, but so far I have not found a solution which would work.

Could anyone point out to me where the problem is?

Edit: Declaration of takeoff

/*...*/
private static string name;
/*...*/

public Takeoff(string id, string name, string guid, string width, string height, string area, string volume, string count)
{
    /*...*/
    Name = name;
    /*...*/
}

/*...*/

public string Name
{
    get { return name; }
    set { name = value; }
}

/*...*/