GHOST !!!! (I don’t know, YOU watch and tell me). It weird

We have a security camera set up in a small room under our kitchen. It’s only purpose is to keep an eye on the well pump. There is an access hatch to gain entry through the kitchen floor . And that is the only door (no windows) we keep a small LED lightbulb lit so that the camera is not in “night mode”.
I am very familiar with floating “orbs”, dust and insects that frequently trigger the motion detection on our cameras. THIS IS DIFFERENT !!
I am NOT saying it’s a ghost or a spirit, I am simply asking for an explanation as to what it could be. There is no air movement in this room it is a small
10’ x 6’ cinder block space with a pump for the well. THATS IT !