Thank you for contacting us and for your kind words for our charting component.
You have actually found a bug in our tooltip behavior. The problem here is that the tooltip does not consider the current PanOffset of the chart and is not positioned properly above the desired point. I would like to thank you for bringing our attention to this issue - I have added 1000 Telerik points to your account for your time. The bug will be fixed for the Service Pack 1 of the Q3 release - scheduled for December 21st.
A possible workaround would be to use the TrackBall behavior, which considers the current PanOffset and is positioned properly above the hit data point:
I hope this information is useful. Do not hesitate to write us back with any question/problem you may have with our tools.
the Telerik team
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