Vertical Scrollbar Overlapping Last Column

Here's the code i'm using for one of my grids:

                     <igtbl:UltraWebGrid ID="gvReceiver" runat="server" Width="100%" DisplayLayout-GridLinesDefault="Horizontal" Height="590px" DisplayLayout-ColWidthDefault="75px">
                    <Bands>
                        <igtbl:UltraGridBand ChildBandColumn="MEMO" Key="BandInfo" >
                            <AddNewRow View="NotSet" Visible="NotSet">
                            </AddNewRow>
                            <Columns>
                                <igtbl:UltraGridColumn AllowGroupBy="No" AllowRowFiltering="False" AllowUpdate="Yes" DataType="System.Boolean" HeaderText="Sel" Key="chkSel" Type="CheckBox" Width="2%" >
                                    <Header Caption="Sel" Title="Sel"></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="IDNO1" HeaderText="Equipment#" Key="IDNO1" Width="10%" >
                                    <Header Caption="Equipment#" Title="Equipment#"><RowLayoutColumnInfo OriginX="15" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="EQMFCD" HeaderText="Make" Width="5%" >
                                    <Header Caption="Make" Title="Make" ><RowLayoutColumnInfo OriginX="15" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="EQMFS2" HeaderText="Serial Number" Width="10%" >
                                    <Header Caption="Serial Number" Title="Serial Number"><RowLayoutColumnInfo OriginX="8" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="ACTDESC" HeaderText="Activity" Key="ACTDESC" Width="15%">
                                    <Header Caption="Activity"><RowLayoutColumnInfo OriginX="6" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="DATE" DataType="System.DateTime" Format="MM/dd/yyyy" HeaderText="Agrmt Date" Key="DATE" Width="8%" >
                                    <Header Caption="Agrmt Date" title="Agreement Date" ><RowLayoutColumnInfo OriginX="4" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="DTSHR8" HeaderText="Agrmt Date" Key="DTSHR8" Hidden="true">
                                    <Header Caption="Agreement Date"><RowLayoutColumnInfo OriginX="4" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="MODEL" HeaderText="Model" Key="MODEL" Width="10%" >
                                    <Header Caption="Model" Title="Model"><RowLayoutColumnInfo OriginX="1" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="SHIPFROM" HeaderText="From Location" Key="SHIPFROM" Width="20%" >
                                    <Header Caption="From Location"><RowLayoutColumnInfo OriginX="6" /></Header>
                                </igtbl:UltraGridColumn>

                                <igtbl:UltraGridColumn BaseColumnName="SHIPLOC" HeaderText="To Location" Key="SHIPLOC" Width="20%" >
                                    <Header Caption="To Location"><RowLayoutColumnInfo OriginX="6" /></Header>
                                </igtbl:UltraGridColumn>
                            </Columns>
                        </igtbl:UltraGridBand>
                    </Bands>
                    <DisplayLayout AllowSortingDefault="OnClient" HeaderClickActionDefault="SortSingle" Name="gvContracts" RowHeightDefault="20px" RowSelectorsDefault="No" SelectTypeRowDefault="Extended" StationaryMarginsOutlookGroupBy="True" Version="4.00" AutoGenerateColumns="False" ColWidthDefault="5%" FixedHeaderIndicatorDefault="NotSet" ColFootersVisibleDefault="NotSet" HeaderTitleModeDefault="OnOverflow" GridLinesDefault="Horizontal" ScrollBarView="Vertical">
                        <FrameStyle BorderColor="InactiveCaption" BorderStyle="None" Height="590px" Width="100%" Font-Bold="True" ></FrameStyle>
                        <GroupByBox><Style BackColor="ActiveBorder" BorderColor="Window"></Style></GroupByBox>
                        <GroupByRowStyleDefault BackColor="Control" BorderColor="Window"></GroupByRowStyleDefault>
                        <ActivationObject BorderStyle="solid" BorderColor="Silver" BorderWidth="2px"></ActivationObject>

                            <HeaderStyleDefault       CssClass="newIFgridheader"></HeaderStyleDefault>
                            <RowStyleDefault          CssClass="newIFgridrow" ></RowStyleDefault>
                            <RowAlternateStyleDefault CssClass="newIFaltrow"></RowAlternateStyleDefault>

                        <FilterOptionsDefault RowFilterMode="AllRowsInBand" AllowRowFiltering="OnServer">
                            <FilterDropDownStyle CssClass="newIFgridfilter" ></FilterDropDownStyle>
                            <FilterHighlightRowStyle CssClass="newIFgridfilterhighlight" ></FilterHighlightRowStyle>
                        </FilterOptionsDefault>

                        <Pager MinimumPagesForDisplay="2" StyleMode="ComboBox">
                            <Style BackColor="LightGray" BorderStyle="Solid" BorderWidth="1px">
                            </Style>
                        </Pager>
                    </DisplayLayout>
                </igtbl:UltraWebGrid>