Grid Check Box Column Issue

[SURYA]

I am getting Dual Check Box in GridCheckBoxColumn in radGrid (please find the attach image that describes the issue)

I am using RadFormDecorator because of this I got this issue when I remove RadFormDecorator it worked good.

Telerik Version is - (UI for ASP.NET AJAX R3 2016 (version 2016.3.914))

<telerik:GridCheckBoxColumn DataField="Late" HeaderText="Late" SortExpression="Late" UniqueName="Late" DataType="System.Boolean" FilterControlAltText="Filter Late column" StringTrueValue="1" StringFalseValue="0"></telerik:GridCheckBoxColumn>

[SURYA]

Admin Please reply to this post 

Is it css error or version error?

[Pierre]

Must be the render mode issue.
Check this : http://www.telerik.com/forums/checkbox-with-masterpages