Raw primeng column not working with headerColumnGroup

Question

I am trying to use column grouping of columns with a frozen column using primeng. I can get the first two columns, but the frozen columns also have the frozen column names in the header.

I called the code here: -

http://www.primefaces.org/primeng/#/datatable/colgroup http://www.primefaces.org/primeng/#/datatable/scroll

source version: - "primeng": "^ 2.0.0",

My html components page contains: -

<p-dataTable [value]="sales"  scrollable="true" scrollHeight="200px"  frozenWidth="450px" unfrozenWidth="600px" >
<p-headerColumnGroup>
    <p-row>
        <p-column header="Brand" [style]="{'width':'250px'}"  ></p-column>
        <p-column header="Last Year Sale" [style]="{'width':'250px'}"></p-column>
        <p-column header="This Year Sale" [style]="{'width':'250px'}"></p-column>
        <p-column header="Last Year Profit" [style]="{'width':'250px'}"></p-column>
        <p-column header="This Year Profit" [style]="{'width':'250px'}"></p-column>
    </p-row>
    <p-row>
      <p-column header="Sale Rate" colspan="5"></p-column>
    </p-row>
</p-headerColumnGroup>
<p-column field="brand" [style]="{'width':'250px'}" frozen="true"></p-column>
<p-column field="lastYearSale" [style]="{'width':'250px'}" frozen="true" ></p-column>
<p-column field="thisYearSale" [style]="{'width':'250px'}"></p-column>
<p-column field="lastYearProfit" [style]="{'width':'250px'}"></p-column>
<p-column field="thisYearProfit" [style]="{'width':'250px'}"></p-column>
</p-dataTable>

My Component file contains: -

     ngOnInit() {
this.sales = [
       {brand: 'Philips', lastYearSale: '49%', thisYearSale: '22%', lastYearProfit: '$745,232', thisYearProfit: '$650,323,'},
       {brand: 'Song', lastYearSale: '17%', thisYearSale: '79%', lastYearProfit: '$643,242', thisYearProfit: '500,332'},
       {brand: 'LG', lastYearSale: '52%', thisYearSale: ' 65%', lastYearProfit: '$421,132', thisYearProfit: '$150,005'},
       {brand: 'Sharp', lastYearSale: '82%', thisYearSale: '12%', lastYearProfit: '$131,211', thisYearProfit: '$100,214'},
       {brand: 'Panasonic', lastYearSale: '44%', thisYearSale: '45%', lastYearProfit: '$66,442', thisYearProfit: '$53,322'},
       {brand: 'HTC', lastYearSale: '90%', thisYearSale: '56%', lastYearProfit: '$765,442', thisYearProfit: '$296,232'},
       {brand: 'Toshiba', lastYearSale: '75%', thisYearSale: '54%', lastYearProfit: '$21,212', thisYearProfit: '$12,533'}
   ];
   }