Why do guys sometimes fidget around me?

I notice sometimes that a guy will see me and get really fidgety. I don't know what this means but it's happened on several occasions I'll walk into a room and there'll be this guy who will get really fidgety-moving a lot, playing with things, looking at me and then when I look at him he looks elsewhere or just looks around a lot trying not to look directly at me. What does it mean and why do people do this because it makes me feel like something is wrong with me or I make them uncomfortable.
Why do guys sometimes fidget around me?
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