To reproduce:
1.Add RadChartView
2.Set vertical axis to be LinearAxis
3.Add DataPoints with value with 14 or more digits. 
4.Set FormatLabel = {0:C} or {0:F0} 
5.Run project and will see that labels overlaps vertical axis.

Workaround: 
Use custom format provider 
this.radChartView1.Axes[1].LabelFormatProvider = new MyFormatProvider();