Dose the Blue circle around Find My Iphone move like this alone

So, when you have your kids, try to make sure they are in a safe place. We are trying to see if they are telling the truth. The kid claims that they were at the location where the small green dot is, not 58th. That is where they started but somehow ended up at the high rise condos on 59th.one point. It starts moving back that way at 2:04. Is this possible? Because the rest of the night, it stayed at the spot on 58th. Are they in trouble, or is this possible?