To reproduce:

public RadForm1()
{
    InitializeComponent();

    DataTable dt = new DataTable();
    dt.Columns.Add("Id");
    dt.Columns.Add("Name");
    for (int i = 0; i < 50; i++)
    {
        dt.Rows.Add(i, "Data" + i);
    }

    this.radGridView1.DataSource = dt;
    this.radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;

    this.radGridView1.AutoSizeRows = false;
}

private void RadForm1_Load(object sender, EventArgs e)
{
    this.radGridView1.Rows[5].MinHeight = 80;
    this.radGridView1.Rows[5].MaxHeight = 100;
}

The Min/MaxHeight is not respected even when resizing the row.

Workaround: set the Height property.