Duplicated Value in TreeDataGrid Cell

[mityamuch]

I have a treeDataGrid with templates for editing and reading. But the value in the last row is displayed twice on focus after clicking Tab. In other rows everything is ok. And it is a bit strange. What is the reason for this problem? How can I solve it?

My template for this cell in the tree:

 <TreeDataGrid Source="{Binding ViewModel.TreeDataGridSource}"
               CanUserResizeColumns="True"
               CanUserSortColumns="False" 
               AutoDragDropRows="False">
               <DataTemplate DataType="viewModels:TreeNodeViewModel" x:Key="VariableTextForRead">
    <Border Classes.Default="{Binding [Value], Converter={x:Static ObjectConverters.IsNull}}"
            Classes.Error="{Binding [Value], Converter={x:Static ObjectConverters.IsNotNull}}"
            ToolTip.Tip="{Binding [Value]}">
        <TextBlock Text="{Binding Value}"
                   VerticalAlignment="Center"
                   HorizontalAlignment="Stretch"
                   Padding="5,0"
                   ToolTip.Tip="{Binding [Value]}"/>
    </Border>
</DataTemplate>
<DataTemplate DataType="viewModels:TreeNodeViewModel" x:Key="VariableForEdit">
    <AutoCompleteBox x:Name="AutoCompleteBox"
                     HorizontalAlignment="Stretch"
                     VerticalAlignment="Stretch"
                     Text="{Binding Value}"
                     ItemsSource="{Binding AvailableVariableNames, FallbackValue=?}"
                     FilterMode="ContainsOrdinal"
                     MinimumPopulateDelay="0"
                     MinimumPrefixLength ="1"
                     IsTextCompletionEnabled="False"
                     IsEnabled="{Binding CanValueBeEdited}"
                     IsVisible="{Binding !IsGroup}">
        <AutoCompleteBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding .}" Width="200"  TextTrimming="CharacterEllipsis" HorizontalAlignment="Left">
                </TextBlock>
            </DataTemplate>
        </AutoCompleteBox.ItemTemplate>
        <i:Interaction.Behaviors>
            <ia:EventTriggerBehavior EventName="Populating">
                <ia:InvokeCommandAction Command="{Binding Path=$parent[UserControl].((adapters:EditorPresenter)DataContext).PopulatingCommand, FallbackValue=?}"
                                        CommandParameter="{Binding UniqueGuid}"/>
            </ia:EventTriggerBehavior>
						<ia:EventTriggerBehavior EventName="LostFocus">
							<ia:InvokeCommandAction Command="{Binding Path=$parent[UserControl].((adapters:EditorPresenter)DataContext).ValueLostFocusCommand, FallbackValue=?}"
                                        CommandParameter="{Binding}" ></ia:InvokeCommandAction>
						</ia:EventTriggerBehavior>
        </i:Interaction.Behaviors>
    </AutoCompleteBox>
</DataTemplate>

My template for the tree:

private static HierarchicalTreeDataGridSource<TreeNodeViewModel> CreateTreeDataGridSource(
    IEnumerable<TreeNodeViewModel> parameters) =>
    new(parameters)
    {
        Columns =
        {
            new HierarchicalExpanderColumn<TreeNodeViewModel>(
                new TextColumn<TreeNodeViewModel, string>(Resources.NameStandardEditorHeader,
                    x => x.Name,options: new TextColumnOptions<TreeNodeViewModel>()
                    {
                        TextTrimming = TextTrimming.LeadingCharacterEllipsis,
                    }), x => x.Parameters),
            new TemplateColumn<TreeNodeViewModel>(Resources.ValueStandartEditorHeader,VariableReadEditTemplateResourceKey,
                VariableCellEditTemplateResourceKey, GridLength.Parse("*"),
                options: new TemplateColumnOptions<TreeNodeViewModel>
                {
                    BeginEditGestures = BeginEditGestures.Tap,
                }),
            new TemplateColumn<TreeNodeViewModel>(Resources.ChannelStandartEditorHeader, ChannelReadCellTemplateResourceKey,
                ChannelCellEditTemplateResourceKey, width: GridLength.Auto),
            new TextColumn<TreeNodeViewModel, string>(Resources.DataTypeStandartEditorHeader, x => x.DataType),
            new TemplateColumn<TreeNodeViewModel>(Resources.DefaultValueStandartEditorHeader,
                DefaultValueCellReadTemplateResourceKey,
                DefaultValueCellEditTemplateResourceKey),
            new TextColumn<TreeNodeViewModel, string>(Resources.MinValueStandartEditorHeader, x => x.MinValue),
            new TextColumn<TreeNodeViewModel, string>(Resources.MaxValueStandartEditorHeader, x => x.MaxValue),
            new TextColumn<TreeNodeViewModel, string>(Resources.DescriptionStandardEditorHeader,
                x => x.Description,
                GridLength.Auto,
                new TextColumnOptions<TreeNodeViewModel>
                {
                    TextWrapping = TextWrapping.Wrap,
                    TextAlignment = TextAlignment.Left,
                    BeginEditGestures = BeginEditGestures.DoubleTap
                })
        }
    };