I came across this issue as well. I'm pretty sure what when Carl was doing the demo for the Radar Chart that he was displaying values on the chart with different scales, since there's only one scale for all the axises I'm thinking he might have been scaling the values coming into the Radar Chart to work with his axis scale. I hadn't gotten around to asking him how he was doing it yet.
Hey Carl, how were you scaling the values you were pulling into your Radar Chart during the demo? 