It looks like you’re trying to cover a lot of individual areas there - Id maybe have started with a single line. A couple of potential problems there:
1- Minimum and maximum object sizes aren’t set
2-Line crossing works best, set to detect objects moving left/right across a vertical line rather than toward/away from the camera
2-The lower line (yellow) is too close to the edge of the field of view. The object needs to be in view before it crosses the line. The camera needs to determine whether or not the object is between the minimum/maximum size, moving in the correct direction, perceived to be human, and that the appropriate proportion of the target has crossed the line/entered the intrusion area. It can’t do that if the target is already in the line as it appears in view.
3-The sensitivity is an inverse of the target size. IE: if the sensitivity was set to 25, then 75 percent of a valid target needs to cross the line/enter the intrusion area. So 100 is not a good value to start with as 0 percent of the valid target needs to cross the line. Start at 59 and adjust from there.
One more thing to be aware of. The AcuSense function works for pre defined “Smart Events” as you have marked in your screenshot. If you do a search for activations with “Smart Playback” and select a different area, it will return results of all targets, human or not as those results come from the NVR searching the metadata embedded in the recorded video (if dual VCA is enabled in camera)