PTZ camera auto adjusting

I use a Logitech Pan/Tilt/Zoom camera along with a desktop computer for accessing Zoom.  I do use a virtual background with an external green screen.  Something (camera or Zoom) is causing my video to Zoom out so you can see the green screen and the rest of the room.  The camera itself is not zooming out.  It's more like the Zoom app is auto adjusting. I get the virtual background all set prior to people joining the session then it may or may not resize as people join.  Zoom and computer software are up to dated; camera has been uninstalled and reinstalled; I've tried original ratio and HD in the video settings.... 

Thank you in advance for any help you can offer.

JL