Image inside rich text box inside radgridview gets changed

[Muthu]

I have rad grid view that will show set of properties. when two properties are images, on scrolling the gridview scrollbar, the first image is replaced by the second one
I dont know why this is happening. I have attached the images.
I am using CellStyleSelector for that column. The requirement is I have to use RichTextBox if that content is RichText and if that content ordinary text then i have to use Text Block

This is how I created the CellStyleSelector

public class PropoertyValueStyleSelector : StyleSelector
    {
        public Style RichTextStyle
        {
            get;
            set;
        }

        public Style TextBlockStyle
        {
            get;
            set;
        }

        public override Style SelectStyle(object item, DependencyObject container)
        {
            var PropertyDetails = item as PropertyDetails;

            if (PropertyDetails != null &&
                PropertyDetails.dataType == "RICHTEXT" &&
                PropertyDetails.HasRichTextFormatting)
            {
                return this.RichTextStyle;

            }
            else
            {
                return this.TextBlockStyle;
            }
        }
    }

And this is how I set the styles in Xaml

<local:PropoertyValueStyleSelector x:Key="properyValueStyle">
            <local:PropoertyValueStyleSelector.RichTextStyle>
                <Style TargetType="telerik:GridViewCell">
                    <Setter Property="ContentTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <telerik:RadRichTextBox IsSpellCheckingEnabled="False" BorderBrush="{x:Null}"
                                                        BorderThickness="0" x:Name="richText" IsReadOnly="True"
                                                        HyperlinkNavigationMode="Click"
                                                        HorizontalAlignment="Left" VerticalAlignment="Center"
                                                        HyperlinkClicked="richText_HyperlinkClicked">
                                    <telerik:RadRichTextBox.Resources>
                                        <telerikHTML:HtmlDataProvider RichTextBox="{Binding ElementName=richText}"
                                                                      Html="{Binding value}"  x:Key="richText"/>
                                    </telerik:RadRichTextBox.Resources>
                                </telerik:RadRichTextBox>
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </local:PropoertyValueStyleSelector.RichTextStyle>
            <local:PropoertyValueStyleSelector.TextBlockStyle>
                <Style TargetType="telerik:GridViewCell">
                    <Setter Property="ContentTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <TextBlock FontWeight="Normal" Text="{Binding value}" HorizontalAlignment="Left"
                                           VerticalAlignment="Center" TextWrapping="Wrap"/>
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </local:PropoertyValueStyleSelector.TextBlockStyle>
        </local:PropoertyValueStyleSelector>

And this is how i implemented the RadGrid

<telerik:RadGridView x:Name="newGrdDetails" ShowColumnHeaders="False" AutoGenerateColumns="False"
                                 ShowGroupPanel="False" ScrollViewer.HorizontalScrollBarVisibility="Hidden"
                                 ScrollViewer.VerticalScrollBarVisibility="Auto"
                                 IsFilteringAllowed="False" RowIndicatorVisibility="Collapsed"
                                 Padding="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                                 Grid.Row="2" Grid.ColumnSpan="2" BorderThickness="1" BorderBrush="Gray"
                                 SelectionUnit="Cell" SelectionMode="Extended" CanUserFreezeColumns="False">
                <telerik:RadGridView.Columns>
                    <telerik:GridViewDataColumn IsReadOnly="True" UniqueName="PropertyName"
                                                DataMemberBinding="{Binding name}" Width="200"  TextWrapping="Wrap" >
                        <telerik:GridViewDataColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding name}"  Width ="Auto" VerticalAlignment="Top"
                                           TextWrapping="Wrap">
                                    <ToolTipService.ToolTip>
                                        <TextBlock Text="{Binding description}" TextWrapping="Wrap" MaxWidth="400"/>
                                    </ToolTipService.ToolTip>
                                </TextBlock>
                            </DataTemplate>
                        </telerik:GridViewDataColumn.CellTemplate>
                    </telerik:GridViewDataColumn>
                    <telerik:GridViewDataColumn x:Name="value" IsReadOnly="True" UniqueName="PropertyValue"
                                                DataMemberBinding="{Binding values}" TextWrapping="Wrap"
                                                CellStyleSelector="{StaticResource properyValueStyle}" >
                    </telerik:GridViewDataColumn>
                </telerik:RadGridView.Columns>
            </telerik:RadGridView>

How can i avoid the replacement of content?