DropDownList in GridView "Flashes" when item selected and reverts

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ASP.NET

DropDownList

Hello Everyone, I have stumbled into a strange issue. I have a GridView with sevEral Columns, two of those Columns have dropdowns. One of the dropdowns works as expected, the other shows the selected value for a second and then reverts to something else.

What makes it strange is that it works fine for 2 out of the 10 values listed in the dropdown.
In the Column template I included a textbox together with the dropdown, but I don't think this will be the issue. I added a break point to the SelectedIndexChange, and by the time it hits the SelectedIndexChange the value has already being changed.

This is a portion of the markup:

<asp:TemplateField FooterText="cCommentDesc" HeaderText="cCommentDesc"  SortExpression="cCommentDesc">
                    <ItemTemplate>
                        <asp:TextBox ID="txtComment" runat="server" Width="200px"
                            Text = '<%# Eval("cComment") %>'
                            ReadOnly="True">
                        </asp:TextBox>

                     <asp:DropDownList
                        ID="cboComment"
                        runat="server"
                        DataSourceID = "SQLCommentsDataSource"
                        DataTextField="cCommentDesc"
                        DataValueField="cRtnVal"
                        OnSelectedIndexChanged="cboComment_SelectedIndexChanged"
                        AutoPostBack="True"
                        Width="100px"
                        style="margin-left: 0px;">
                     </asp:DropDownList>

                    </ItemTemplate>

</asp:TemplateField>

SQLCommentsDataSource is defined as:

SELECT TOP 1 NULL AS cCommentDesc, NULL AS cRtnVal, 0 As nOrder
                           FROM DropDownsValues 
                           UNION
                           SELECT cValue AS cCommentDesc, cRtnVal, nOrder
                           FROM DropDownsValues
                           WHERE cKeyName = 'ServerComments'
                           ORDER BY nOrder 

Thank you in advance.

Luis