Hello Nishant,
Could you please disable the ajax on the page and verify if the same behavior could be replicated? Also please makes sure that when the page is ajaxified you are following the instructions provided in the help topic below for correct configuration of the ajax with RadTabStrip/RadMultiPage controls:
http://www.telerik.com/help/aspnet-ajax/ajax-tips-and-tricks.html
If this does not help please provide your full page markup as well as the related code behind so that we could further research on your scenario and o our best top provide a proper solution.
Regards,
Maria Ilieva
Telerik
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