Thank you for the project sent. As I wasn't able to isolate the problem page, I am attaching a sample web site based on your scenario. Please, modify the example so it demonstrates the described behavior and attach it back. Note that you will have to add Telerik.Web.UI.dll and Telerik.Web.UI.Skins.dll to the Bin folder of the project. You will also have to add the your CSS files to the css folder.
You probably have noticed that we have deleted from your post the link to your project. That is because it contained Telerik dll files. That could be treated as unauthorized distribution of our products and it is strictly forbidden. Please, be careful not to distribute them in this or any other way as such actions could lead to legal actions.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items