Spotlight cam loose with tight collar

Hi all, I've recently installed my solar spotlight cam and am having an issue getting it to stay in place. It is mounted to the wall without issue, but the security screw on the collar is as tight as possible but the camera still moves with a tiny bit of effort. My worry is a strong wind will move it or someone can come up and easily point it away from my porch. Does the spotlight cam always have some movement with the collar tight or is it supposed to have no movement? Thanks so much!