When there is a lot of data my PivotMatrix loses the style, what could be the cause?

I have already detected the problem and it is because in class I am using the following code:

class ReporteItemsVendidos extends \koolreport\KoolReport
{
    use Friendship;
    use FontAwesome;
    function setup()
        {
        }
    .
    .
    .
}

The problem is because of the use FontAwesome line that I use for some icons, removing that line solves the problem but damages other types of reports.