模态窗口变得模糊，没有明显的原因

Question

我不知道为什么，但是我的模态窗口变得模糊了。不知道是什么原因造成的，这让我很沮丧。在进行此操作时，我没有注意到这一点（我想我应该会发现），突然间，我想，这是上帝的名义...

令人惊讶的是，它仅发生在模态中，而不发生在主窗口中，因此它一定是我更改过的东西。我已经检查过我没有模糊的效果，以防万一我不经意地激活了它，并且不知道还有什么可能导致这种情况。如您在图像中所见，我应用的唯一效果是dropShadow。

以下是其外观的图片： blurry modal

图片的质量似乎还不够好，但是无论如何您都可以看到模态比背景（主窗口）模糊得多。

正如您在另一幅图中所看到的，在设计窗口中它并没有显示模糊，以防万一这可能有所帮助。 not blurry in design window

可能是什么原因引起的？

编辑：顺便说一句，您在第一个图像中看到的内容（不是在设计窗口中）以编程方式放置在那里。

<Window x:Class="CholaYTD.WpfMBFin"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:CholaYTD"
    mc:Ignorable="d"
    Title="WpfMBFin" Height="275" Width="400" ResizeMode="NoResize" ShowInTaskbar="False" WindowStartupLocation="CenterScreen" WindowStyle="None" Background="{x:Null}" Foreground="#FFEBF3FA" AllowsTransparency="True" SnapsToDevicePixels="True">
<Border BorderThickness="1" BorderBrush="#000000" CornerRadius="25" Background="#2F3138" VerticalAlignment="Center" HorizontalAlignment="Center" >
    <Border.Effect>
        <DropShadowEffect Opacity="0.8"/>
    </Border.Effect>
    <DockPanel MinWidth="375" MinHeight="100" Height="250" HorizontalAlignment="Center" VerticalAlignment="Top">
        <StackPanel DockPanel.Dock="Top"  HorizontalAlignment="Center" VerticalAlignment="Top" >
            <!-- Titulo -->
            <Label Content="DESCARGAS FINALIZADAS" HorizontalAlignment="Center" Margin="0 15 0 0" Foreground="#FFEBF3FA" FontFamily="Berlin Sans FB"
                   FontSize="20" />
            <!-- Descripcion -->
            <Label Content="Las descargas finalizaron con éxito." HorizontalAlignment="Center" Margin="0 5 0 0" Foreground="#FFEBF3FA" 
                   FontFamily="Berlin Sans FB" FontSize="16" />
            <!-- Descripcion fallidas -->
            <!--<Label Content="Las descargas finalizaron con éxito." HorizontalAlignment="Center" Margin="0 0 0 0" 
                   Foreground="#FFEBF3FA" FontFamily="Berlin Sans FB" FontSize="16" />-->
            <!-- Enlaces -->
            <TextBlock Name="textBox_enlaces" HorizontalAlignment="Center" Margin="0 0 0 0" Foreground="#FFEBF3FA" FontFamily="Berlin Sans FB" FontSize="16" >

            </TextBlock>
        </StackPanel>
        <!-- Boton OK -->
        <StackPanel Name="stackPanelCerrar" DockPanel.Dock="Bottom" Height="35" Width="60" VerticalAlignment="Bottom" Margin="0 0 0 10">
            <Border Name="borderCerrar" BorderThickness="1" BorderBrush="#000000" CornerRadius="15" Background="#9FBED1" MouseDown="Border_MouseDown" MouseEnter="Border_MouseEnter" MouseLeave="Border_MouseLeave" Cursor="Hand" >
                <Label Name="labelCerrar" HorizontalAlignment="Center" VerticalAlignment="Bottom" FontFamily="Berlin Sans FB" FontSize="20" Foreground="#2F3138" >
                    OK
                </Label>
            </Border>
        </StackPanel>        
    </DockPanel>
</Border>    

public partial class WpfMBFin : Window
{
    private List<string> listaEnlaces;

    public WpfMBFin(List<string> failedList)
    {
        listaEnlaces = failedList;

        InitializeComponent();
        // declaramos la venata principal como padre de esta ventana
        this.Owner = App.Current.MainWindow;

        crearEnlaces();
    }

    private void crearEnlaces()
    {
        string youtubeURLStarting = "https://www.youtube.com/watch?v=";
        string textoFinalEnlaces = "Sin embargo, ";
        if (listaEnlaces.Count < 2)
        {
            textoFinalEnlaces += "el siguiente video no estaba disponible:\n";
            Hyperlink hLink = new Hyperlink();
            hLink.NavigateUri = new Uri(youtubeURLStarting + listaEnlaces.ElementAt(0));
            hLink.RequestNavigate += new System.Windows.Navigation.RequestNavigateEventHandler(Hyperlink_RequestNavigate);
            hLink.Inlines.Add(youtubeURLStarting + listaEnlaces.ElementAt(0));
            textBox_enlaces.Inlines.Add(textoFinalEnlaces);
            textBox_enlaces.Inlines.Add(hLink);

        }
        else
        {
            textoFinalEnlaces += "los siguientes videos no estaban disponibles:\n";
            foreach (string link in listaEnlaces)
            {
                textoFinalEnlaces += "\n" + youtubeURLStarting + link;
            }
        }            
    }

    // HANDLER de Hyperlinks
    private void Hyperlink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
    {
        System.Diagnostics.Process.Start(e.Uri.AbsoluteUri);
    }

    // EFECTO BOTON
    private void Border_MouseDown(object sender, MouseButtonEventArgs e)
    {
        this.Close();
    }

    private void Border_MouseEnter(object sender, MouseEventArgs e)
    {
        stackPanelCerrar.Height = 36;
        stackPanelCerrar.Width = 62;

        borderCerrar.BorderBrush = (Brush)(new BrushConverter().ConvertFrom("#EBF3FA"));
        borderCerrar.BorderThickness = (new Thickness(2, 2, 2, 2));
        borderCerrar.Background = (Brush)(new BrushConverter().ConvertFrom("#EBF3FA"));

        labelCerrar.Foreground = (Brush)(new BrushConverter().ConvertFrom("#2F3138"));
    }

    private void Border_MouseLeave(object sender, MouseEventArgs e)
    {
        stackPanelCerrar.Height = 35;
        stackPanelCerrar.Width = 60;

        borderCerrar.BorderBrush = Brushes.Black;
        borderCerrar.BorderThickness = (new Thickness(1, 1, 1, 1));
        borderCerrar.Background = (Brush)(new BrushConverter().ConvertFrom("#9FBED1"));

        labelCerrar.Foreground = (Brush)(new BrushConverter().ConvertFrom("#2F3138"));
    }
}