Looking at the lights in the chor...
-Living Room Spot is keyframed to go from 30% to 100% darkness so anything in between will not be 100%
-Landing Spot is keyed from 45% to 50%
-Charlies Room is keyed at 35%
-CarSpot goes from 30% to 100%
I think one or more of those is the trouble.
Delete all those darkness keys and set them to 100% darkness at the outset.
For partial illumination or shadows that are not 100% black, add a dim light in the scene to fill in the darkness rather than use the shadow darkness percentage.
Try that and let me know if there is still problem.