RibbonHeaderVisibility causing ribbon buttons to overlap the window title bar

Hello. I'm trying to setup a ribbon in a window where the ribbon's header (the tabs) are hidden or collapsed. I've been changing the RibbonHeaderVisibility parameter which does seem to hide or show the header, however when collapsed, it is overlapping my window's (which is a DXRibbonWindow) title bar. For example, I've added some text into the Title parameter and I can see it when the RibbonHeaderVisibility is set to Visible, but when set to collapsed it seems to be overlapped by the ribbon control.

I would like to use a collapsed ribbon while being able to see the window's title/icon/etc.

Attached is an image and below is my window's code.

XAML
<dxr:DXRibbonWindow  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"  
    xmlns:dxr="http://schemas.devexpress.com/winfx/2008/xaml/ribbon"  
    xmlns:local="clr-namespace:Unfolder.View"  
    xmlns:dxb="http://schemas.devexpress.com/winfx/2008/xaml/bars"  
    x:Class="Unfolder.View.UFMaterialManagerView"  
    mc:Ignorable="d"  
    d:DesignHeight="300" d:DesignWidth="400" Height="300" Width="400" IsRibbonCaptionVisible="True" Title="Unfolder Material Manager" WindowStartupLocation="CenterScreen" ResizeMode="NoResize">  
    <Grid>  
        <Grid.RowDefinitions>  
            <RowDefinition Height="*"/>  
            <RowDefinition Height="30"/>  
        </Grid.RowDefinitions>  
        <dxr:RibbonControl Width="Auto" AllowCustomization="False" AllowKeyTips="False" AllowMinimizeRibbon="False" RibbonStyle="OfficeSlim" ShowApplicationButton="False" ToolbarShowCustomizationButton="False" ToolbarShowMode="Hide" RibbonHeaderVisibility="Collapsed" IsHeaderBorderVisible="True" RibbonTitleBarVisibility="Visible">  
            <dxr:RibbonDefaultPageCategory Caption="defaultCategory" IsVisible="False">  
                <dxr:RibbonPage Caption="Home">  
                    <dxr:RibbonPageGroup Caption="Tools">  

                        <dxb:BarButtonItem Content="Add"/>  
                        <dxb:BarButtonItem Content="Delete"/>  

                    </dxr:RibbonPageGroup>  
                </dxr:RibbonPage>  
            </dxr:RibbonDefaultPageCategory>  
        </dxr:RibbonControl>  

        <Grid Grid.Row="1" Background="White">  
            <Button Content="OK" HorizontalAlignment="Right" Height="25" VerticalAlignment="Center" Width="90" Command="{Binding OKCommand}" Margin="0,0,10,0"/>  
        </Grid>  
    </Grid>  
</dxr:DXRibbonWindow>