No, the problem is that the default "Reply" button doesn't add quoted
text to the edit box it opens up.

To get quoted text you have to click on "show options" next to the
poster's name, then use the "Reply" button that it exposes.

Then the quoting is there, done in the classical style.

And if you don't use a newsreader that does threading properly using
the References: header, that's your problem.

--Blair