Why do some men switch from waving to hugging women they barely know?

Im not mad at it because i fine with giving hugs and high fives as long as they're not being creepy, but i would never initiate changing a greeting from a wave ๐Ÿ‘‹ hi to an open arm hug walk up hug. I've just noticed that it happens a lot when I see the same guys over and over again. None of them know my private life or opinions, some not even my name.
I don't think they give a thought to it. Im not reprimanding them, just wondering about the behavior? Maybe it's my body language, too? I want to be aware, though because a few times some men saw it as an invitation and I don't know the difference.
Why do some men switch from waving to hugging women they barely know?
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