Guys, My male coworkers get quiet when I walk by. Is this a bad thing?

Both coworkers and I make a good team, separately and when we work together.
When we work together, I noticed they sometimes quiet down or stop talking when I walk by. Sometimes I feel like I made them mad, some how upset them. But neither has ever told me I have.
The one has an intrest in me, though I don't know if its a romantic intrest or friendship.
Guys, My male coworkers get quiet when I walk by. Is this a bad thing?
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