It's late, so this will be brief. In an Art of Charm episode about body language, the guest speaker said something that I thought was really interesting. To paraphrase:
One or two nonverbal cues may not mean much. Meaning is conveyed in sentences.
In other words, nonverbal cues convey a message in clusters. Individual cues may mean something, or they may simply be that person's quirk or unrelated thought/insecurity.