WPF DataGrid overlapping column - wpf

Question

The issue arises when I have disabled horizontal scrollbar (shown below) by using ScrollViewer.HorizontalScrollBarVisibility="Disabled", so all columns should fit.
I have 4 columns in my DataGrid. The first one has its Width set to "*", while other 3 Width is "Auto". There are buttons in the 3rd and 4th columns. The 3rd column contains two buttons one of which can has its Visibility set to Collapsed.
When first shown on the screen, two last columns with buttons overlap each other like shown in the picture below:
As you can see, there is more than enough space in the DataGrid.
If I resize the window or change the DataGrid's Visibility, next time it appears the columns will display properly.
Code:
<DataGrid AutoGenerateColumns="False" IsReadOnly="True" CanUserAddRows="False" CanUserReorderColumns="False" CanUserResizeColumns="False" CanUserResizeRows="False" HeadersVisibility="Column" SelectionUnit="FullRow" GridLinesVisibility="Horizontal" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.CanContentScroll="False" Margin="5">
<DataGrid.Columns>
<DataGridTemplateColumn Width="*">
<DataGridTemplateColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Text" />
</DataTemplate>
</DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Text}" TextTrimming="WordEllipsis" VerticalAlignment="Center" Padding="5" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Width="Auto">
<DataGridTemplateColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Enabled" />
</DataTemplate>
</DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding IsEnabled}" HorizontalAlignment="Center" VerticalAlignment="Center" Padding="5" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Width="Auto">
<DataGridTemplateColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Order" />
</DataTemplate>
</DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button Command="{Binding Data.MoveOptionUpCommand, Source={StaticResource BindingProxy}}" CommandParameter="{Binding}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5">
<Button.Style>
<Style TargetType="Button" BasedOn="{StaticResource {x:Type Button}}">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
<Image Source="/Resources/Images/Images16/Up.png" />
</Button>
<Button Command="{Binding Data.MoveOptionDownCommand, Source={StaticResource BindingProxy}}" CommandParameter="{Binding}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5">
<Button.Style>
<Style TargetType="Button" BasedOn="{StaticResource {x:Type Button}}">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Visibility" Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
<Image Source="/Resources/Images/Images16/Down.png" />
</Button>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Width="Auto">
<DataGridTemplateColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Actions" />
</DataTemplate>
</DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button Command="{Binding Data.ShowOptionEditAreaCommand, Source={StaticResource BindingProxy}}" CommandParameter="{Binding}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5">
<Image Source="/Resources/Images/Images16/Edit.png" />
</Button>
<Button Command="{Binding Data.RemoveOptionsCommand, Source={StaticResource BindingProxy}}" CommandParameter="{Binding}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5">
<Image Source="/Resources/Images/Images16/Remove.png" />
</Button>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
Edit: added XAML code.