It looks like there is an issue with the code. It isn't looking at the database column for the previously selected value. Line 155 should be:
<input type="radio" name="User_Update_group_4_Accepted" id="User_Update_group_4_Accepted__1" value="this" class="formRadioField_Standard" <?php if (!(strcmp((isset($_GET["invalid"])?ValidatedField("userupdate","User_Update_group_4_Accepted"):"".$row_SecurityAssistMSFields["Accepted"] .""),"this"))) {echo "checked=\"checked\"";} ?> tabindex="4" title="Please enter a value.">
and line 158 should be:
<input type="radio" name="User_Update_group_4_Accepted" id="User_Update_group_4_Accepted__2" value="that" class="formRadioField_Standard" <?php if (!(strcmp((isset($_GET["invalid"])?ValidatedField("userupdate","User_Update_group_4_Accepted"):"".$row_SecurityAssistMSFields["Accepted"] .""),"that"))) {echo "checked=\"checked\"";} ?> tabindex="5">