ICR is set to automatic, IR Light is set to off
I tried some various settings of the motion grid as suggested. It appears the grid is not nearly an exact area. If there is motion in proximity to a grid, motion is detected. Very repeatable, put grids on the sidewalk along the road and car traffic will set off motion detection. Watched one example of a bird walking around in the yard, it was about a foot away from the grid, when motion detection occured, about one "block" away from the actual grid.
Bottom line, looks like motion detection is happening about one "block" outside of the actual grid definition.