Hello Will Monte !

The deal relates to the Google Pie Charts as it can't show the diagram which contains the negative values. So you may try to apply another type of charts in the following code of studio/js/dashboard.js

var oChart = new google.visualization.PieChart(oChart[0]);

    oChart.draw(oDataTable, {

        chartArea: {

            left:10,

            top:10,

            width:'92%',

            height:'92%'

        }

    });