just an update, i factory reset, reinstalled firmware, factory reset the nvr and started from scratch and the issue persists. a possum triggered ivs human detection about 10 hours later.
what's the difference between "global sensitivity" in global config vs sensitivity in the ivs rule? what do they actually do? i assumed global sensitivity would adjust all your ivs sensitivity rules all at once but that doesn't seem to be the case as adjusting the global doesn't change the displayed value of the ivs one.
if the max detection size is greater than the ivs intrusion area, can this cause a problem? i have no min size as recommended but max size can't be deleted. also, on the nvr 5216-ei there is a min size showing that can't be deleted. all settings were made in cameras. ai is by camera, motion & smd & accupick is off on all devices.
for the most problematic cam, i have put the ivs rule sensitivity down to a 2 to see what happens.