This is fusioncharts for filemaker. It is only apparent when you preview or try to print.
This is an example URL we have generated from Filemaker. If you paste into Internet Explorer you will see the chart normally. However if you print it, you should be able to replicate the issue.
file:/C:/Charts/FusionCharts.html?v=3&sep=;&chart=[chartType=Doughnut2D;chartWidth=535;chartHeight=330]&chartParams=[;animation=0;;formatNumberScale=1;useRoundEdges=1;showValues=1;rotateLabels=1;slantLabels=1;showPercentValues=1;;decimalPrecision=1;;;;;numberPrefix=