I think it's due to a few factors. One is it is most vivid to recall when the committee discusses the round and about to vote, and another is the panel is intimately familiar with the audition excerpts by then. You might think we would be more critical by the end, but people are inherently decent and I think we actually become more forgiving, after hearing dozens of candidates make some sort of mistake. And we are all happy the end is near, when the last candidate plays, so we listen with a much more positive mind frame.
All of this is to say: could you send the three song selections to everybody who is attending, so they can become intimately familiar with the recordings on their own system, so they have a base frame of reference? And be wary of favouring the last candidate!