RadzenDataGridHeaderColumn Composite Column Header Border not Closed Properly

Hi all, I have been following the Radzen Demo to implement Composite Column for my DataGrid and I noticed the right Border line of the Composite Column is not closed right as shown in screenshot below.

The following is my code snippet:

<RadzenDataGrid Data="@filteredThawingValues" TItem="ProjectionValues"  AllowColumnResize=true AllowAlternatingRows=true AllowSorting="true" PageSize="10" AllowPaging="true"
                    CellRender="@HighlightCurrentRow">
            <Columns>
                <RadzenDataGridColumn TItem="ProjectionValues" Property="HeaderValue" Title="Thawing Date" Width="120px" TextAlign="TextAlign.Center" />
                <RadzenDataGridColumn TItem="ProjectionValues" Property="ValueHour1" Title="Thawing Batch" Width="150px" TextAlign="TextAlign.Center" />
                <RadzenDataGridColumn TItem="ProjectionValues" Property="ValueHour2" Title="Carry Forward" Filterable=false Sortable=false TextAlign="TextAlign.Center">
                    <Columns>
                        <RadzenDataGridColumn TItem="ProjectionValues" Property="ValueHour2" Frozen="true" Title="Regular"  TextAlign="TextAlign.Center"/>
                        <RadzenDataGridColumn TItem="ProjectionValues" Property="ValueHour3"Frozen="true" Title="Large" TextAlign="TextAlign.Center"/>
                    </Columns>
                </RadzenDataGridColumn>
                <RadzenDataGridColumn TItem="ProjectionValues" Property="ValueHour4" Title="Time in Chiller" Width="180px" TextAlign="TextAlign.Center">
                    <HeaderTemplate>
                        Time in 
                        Chiller
                    </HeaderTemplate>
                    </RadzenDataGridColumn>
                <RadzenDataGridColumn TItem="ProjectionValues" Property="ValueHour5" Title="Time Ready for Proofing" Width="180px" TextAlign="TextAlign.Center">
                    <HeaderTemplate>
                        Time Ready<br/>
                        For Proofing
                    </HeaderTemplate>
                    </RadzenDataGridColumn>
                <RadzenDataGridColumn TItem="ProjectionValues" Property="ValueHour6" Title="Expiry Date" Width="180px" TextAlign="TextAlign.Center" />
         </Columns>
        </RadzenDataGrid>

Any advice to overwrite the styling or overcome this?

If this is some customized version of our Material theme should be in our latest update: