Load the URL and click on 1-1 or 1-2. Then, you will see checked radio button.
Created attachment 575806 [details] [diff] [review]
Strangely Chrome seems to have the same bizarre behavior. Opera doen't.
Didn't test IE9.
Comment on attachment 575806 [details] [diff] [review]
Please check what IE does.
If IE, Gecko and Webkit all have this bug currently, it is possible
that we can't change the behavior.
IE9 behaves same as Opera. I guess WebKit has same mistake...