When people use the "quick reply" function, it will post to the last person that replied to the thread. This does not mean that the person using "quick reply" is replying to that particular (last) person. So don't take it personal if you see your name being replied to in a post that doesn't seem to be for you.
For those that use the "quick reply" in responding to someone other than the last poster in the thread, put the name of the person you intend to reply to in your post. This should reduce confusion. Somewhat.