What does it mean when a girl looks at your lip when she is talking to you?

MyLastOne
I noticed my banker who I met for the first time to make a new account, I gave her good eye contact as I listened, I noticed the color of her eyes.

When she was talking to me, I noticed she alternate at times between my lips and eyes. I find it a little odd since I'm a client and she's a banker.

Although we did do some unnecessary chit chat.
What does it mean when a girl looks at your lip when she is talking to you?
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