Body language

Hey everyone, I have a question about body language. I work as a security guard at a liquor store and don’t usually interact much except for a quick “hello” here and there. My job requires me to walk around and observe people for theft. Something I noticed when walking past women is there’s usually a crossing of arms or a fixing of the dress kinda in a covering up type of gesture. Is this a normal behavior or is it something I’m doing wrong? (Ps I promise I do t stare lol)