I keep accidentally making eye contact with a girl I work with, what is going on?

I work at a restaurant and me and my coworker keep randomly making eye contact. For example I'll be doing something alone then look up and instantly catch eyes with her from far away. Or I'll be walking through the crowded restaurant and we end up locking eyes. This has happened quite a few times over the past few weeks but I don't know what to think.

She's nice to me when we talk, but don't sense anything else other than just being nice. Does she think I'm weird or suspect I'm staring at her?

Thanks to all who answer
I keep accidentally making eye contact with a girl I work with, what is going on?
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