I have a BarSeries in a RadCartesianChart that renders its labels incorrectly on UWP. Labels are more or less fine on Android and iOS (iOS I need to do other platform specific adjustments to, but that's unrelated to this issue).
On UWP the value labels on the BarSeries are rendered to the left of the bar instead of on top of the bar. See attached picture. Note how the value label on the first bar is cut off and cannot be seen because it extends to the left of the screen.