Why does this guy keep smirking at me?

This guy recently started at my office. he's been looking at me in the kitchen, and he appears to be around my age. Often when he walks past my desk on the way to the restroom, he turns around and then stares and smirks at me. Most of the time I'm just sitting there working, and I'm not sure what I've done to make myself a target. Why is he doing this and how should I handle it?
Why does this guy keep smirking at me?
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