asp DataList SelectedItemTemplate out of step

I have a datalist listing a number of records (record1, 2, 3 etc). There is an ItemTemplate and a SelectedItemTemplate, each identified by a literal value, and a field from the data.

I want to click the Linkbutton and display the SelectedItemTemplate for the selected record. However, the display of the SelectedItemTemplate is out of step by one: if I click the linkbutton for record2, nothing changes. If I click the linkbutton for record4, the SelectedItemTemplate for record 2 is displayed. If I click the linkbutton for record8, the SelectedItemTemplate for record 4 is displayed. The  SelectedItemTemplate is always one behind the record I last selected.

Code is attached. Am I doing something silly or stupid?

<%@ Page Language="VB" MasterPageFile="~/Partner/PartnerMasterPage2.master" Title="Tenant Assistance Program" StylesheetTheme="Theme1" %>
<script runat="server">
    
</script>
<asp:Content ID="Content1" ContentPlaceHolderID="contentPlaceHolder1" Runat="Server">

    <asp:Panel ID="pnlMulti" runat="server">
        <asp:DataList ID="lstTenants" runat="server" DataKeyField="Tenant_ID" 
        DataSourceID="SqlDataTenantNames" Width="485px" >

            <ItemTemplate>
                ITEM Template:<asp:LinkButton ID="LinkButton1" runat="server" CommandName="Select" 
                    CssClass="lblBuildingTitle2" Text='<%# Eval("Tenant_Name") %>'></asp:LinkButton>
                <br />
            </ItemTemplate>

            <SelectedItemTemplate>
                SELECTED Template:<asp:Label ID="Tenant_NameLabel" runat="server" CssClass="lblBuildingTitle2" 
                    Text='<%# Eval("Tenant_Name") %>' />
                    <br />
            </SelectedItemTemplate>

        </asp:DataList>
    </asp:Panel>

    <asp:SqlDataSource ID="SqlDataTenantNames" runat="server" 
        ConnectionString="<%$ ConnectionStrings:dbCOMPASSConnectionString %>" 
        SelectCommand="SELECT Building_ID, Tenant_ID, Tenant_Name FROM tblPartnerBuildingTenants WHERE (Building_ID = @Building_ID) ORDER BY Sort_Seq, Tenant_Name">
        <SelectParameters>
            <asp:SessionParameter Name="Building_ID" SessionField="Building_ID" />
        </SelectParameters>
    </asp:SqlDataSource>
</asp:Content>

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