The issue is Radio Buttons Are Not Mutually Exclusive When Used in a Repeater Server Control.

From Microsoft

This is a known issue of ASP.NET template databound control(such as repeater, DataList …). When you put RadioButton in such control's template, since its "groupName" is assigned a unique value each row,. Here is the public kb article document this issue:

Server Control 

Here is the work around

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