The described issue could be related to a logged bug, which is fixed in the 2014.2.618 (2014 Q2) version.
I suggest following this feedback portal item
and examine if this is the same scenario. If you can verify that, I recommend upgrading to the latest version of the Telerik UI for ASP.NET AJAX suite.
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.