Welcome to the WPF feedback portal. We’re happy you’re here! If you have feedback on how to improve the WPF, we’d love to hear it!>
Thanks for joining our community and helping improve Syncfusion products!
It looks like there is a bug plotting the second point in a FastLIneSeries: it draws a straight line from the first point to the third point. In the attached sample, the chart contains a FastLineSeries and a normal LineSeries, with the values offset by 10. The series lines should be parallel. Also note the Track Ball for the second point of the FastLineSeries does not on the line, but is in the correctly location.