This might sound a weird issue but I doubt if it's a bug in the RadGrid control. You might want to reference my StackOverflow question I posted before posting on this forum.
So I am using a Telerik RadGrid control in my asp.net application and I have a GridTemplateColumn which has a CheckBox as an ItemTemplate. Now if I use the html input checkbox control then the RadGrid is rendered properly on the UI. However, if I use the asp.net server-side checkbox control then the data is rendered as it is without the table formatting. Please refer the question posted on StackOverflow as it has a detailed description and screenshots of the problem. Early response is highly appreciated.