DGV CheckBoxes Not Checking Checkbox

Good Evening,

The WinForm project I am working on basically edits XML's easily without having to go through the code.

The problem I am having currently is when I load the XML with values I know are true. It does not tick the DataGridViewCheckBox, even though it is checked as true.

I've done a bit of research (well quite alot trying alot of different things) with no luck.

Below is the Method that Created a Column when a User is added and checks it depending if it is true of not...However it isn't physically checking the box.

private void AddColumnsUsersToSourceAllocation()
    {
        gridSourceToUser.SuspendLayout();
        UpdateGrid(gridSources);
        foreach (FCMUser user in fCMUserBindingSource.List)
        { 
            string userName = user.name;
            List<string> headerNamesList = new List<string>();

            for (int i = 1; i < gridSourceToUser.ColumnCount; i++)
            {
                headerNamesList.Add(gridSourceToUser.Columns[i].HeaderText);
            }
            if (!headerNamesList.Any(x => x.Contains(userName)))
            {

                userCheckBoxColumn = new DataGridViewCheckBoxColumn()
                {
                    HeaderText = userName,
                    FalseValue = 0,
                    TrueValue = 1,
                    Visible = true,
                    Name = userName,
                };
                gridSourceToUser.Columns.Add(userCheckBoxColumn);
            }
            foreach (var userSource in user.fusionUserSources)
            {
                if (userSource.UserSourceChkBox.MyCheckedState == true)
                {
                    DataGridViewCheckBoxCell dgvCheckBox = gridSourceToUser.Rows[sourceProps.GetSourceIndex(userSource.id)].Cells[user.name] as DataGridViewCheckBoxCell;
                    if (dgvCheckBox == null) throw new ArgumentNullException(nameof(dgvCheckBox));
                    dgvCheckBox.Selected = true;
                    dgvCheckBox.Value = true;

                }
            }
            UpdateGrid(gridSourceToUser);
        }
        gridSourceToUser.ResumeLayout();
    }

Any help what so ever would be apprenticed, I'll try anything at this point :p

EDIT I have tried giving the added DataGridViewCheckBoxColumn a DataPropertyName which is a bool. This does work for loading the XML, however when editing clicking a Checkbox, clicks all the Checkboxes and sets them as true :s.

If you know a way around this feel free to say :)