Why did the Manager give me a cheeky grin during the interview?

I recently Had a Panel Interview with 3 hiring Managers. While I was looking at Manager 1 who was Talking Most of the Time I noticed that Manager 2 kept staring at me with a mischievous smile that I usually See in men who Flirt with me. It Looked like a Flirty smile rather Than a friendly Smile and I have Never Seen this expression in his Face again since I started Working with him.

Am I just imagining things or could He Really have flirted with me during the Interview? I noticed that He Tried to advocate for me but He is a nice Person in General so it doesn't mean much. I don’t See any Signs of attraction now that I work with him except one Time when He leaned in a bit too Close to my Face when we were talking. Now He tends to be strictly Professional with me and Never smiles While being chummy with everyone Else (Even female coworkers).

Why did the Manager give me a cheeky grin during the interview?
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