Hi Ram,
This is most likely normal behavior, as several elements of the Chart don't deal well with repositioning/resizing.
A workaround might be possible, however it will depend on how your code is setup. If you have a valid support subscription, you can try sending a sample project to support@xceed.com to have us take a look at it. Please include a link to this forum thread for reference. Thank you.
Diane Lafontaine
Technical Support / Technical Support Team Lead
Xceed Software Inc.