WPF mousePos and icon.Margin align. Visual rep does not.

        <Viewbox x:Name="ViewMap" MouseLeftButtonDown="Viewbox_MouseLeftButtonDown" Stretch="Uniform">
                    <!-- Your image display content -->
                    <Image x:Name="imageControl" MouseWheel="ImageControl_MouseWheel"   Loaded="ImageControl_Loaded" Stretch="Uniform">
                    </Image>
                </Viewbox>

private void Viewbox_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    // Get the cursor position relative to the mainGrid
    Point cursorPosition = e.GetPosition(imageControl);
    Debug.WriteLine($"{cursorPosition}");
    // Show the icon at the cursor position
    ShowIcon(calibrationIcon, cursorPosition);
}
private void ShowIcon(Image icon, Point position)
{
    icon.Margin = new Thickness(position.X - icon.ActualWidth / 2, position.Y - icon.ActualHeight / 2, 0, 0);
    Debug.WriteLine($"{icon.Margin}");
    // Show the icon
    icon.Visibility = Visibility.Visible;

}