Indeed, currently when scrolling along the X axis, its range is re-calculated and it depends on the available datapoints. This might lead to the effect you have observed -- the left range end updated, when performing a scroll relatively small. Our developers are aware of the issue and will be looking for possible improvements.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!