Why is he friendly to anyone but me?

One of my 3 new Bosses is very chatty and upbeat with everyone but me, Even with employees from Other departments He barely knows. With me He is Polite but a bit cold and only jokes with me in group settings.
The first time I saw him during the panel Interview I felt like He stared at me a bit too Long with a wide grin and did Not look away when I caught him.
What could be the reason for his cold attitude towards me? I was always polite to him but for some reason He seems to avoid me

Why is he friendly to anyone but me?
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