Thanks for using syncfusion product. We have analyzed the reported issue with our sample; we are not able to reproduce the issue. Can you please check with the sample in the following location?
Sample Location : http://www.syncfusion.com/downloads/support/forum/118713/Range-1888840273.zip
If still you face the problem, please revert us by modifying the sample based on your application along with replication procedure. This would be helpful for us to serve you.
Please let us know if you have any queries.
Akbar basha KM.