I suspect you have motion detection or SMD on in that driveway camera as well. Confirm that neither has the box checked.I've started playing with IVS and the human and vehicle detection but I'm having issues with it. When I turn it on on my driveway camera it sends alerts every 30 or 40 seconds. On the camera in the bushes I get zero alerts with it turned on I'm just not sure what I'm doing wrong. I told my wife I was going to start using the IVS and told her what it does and she told me no. She said she likes to see all the wildlife motion triggers. I'd actually like to figure out how it works so I can use it on a clone camera. I am also following that thread about the IVS.
Next make sure you have Smart Plan enabled for IVS.
For IVS, do not specify a minimum target size. Leave it at 0,0 and only add one in if something like a dog is triggering. Most will find that the default 0,0 works well.
Do you have an SD card in the camera - that is a great way to playback and turn on the IVS rules and see what was triggering it. Or if it happens once per minute, watch it live with the IVS triggers on to see what is causing it.
Share some screen shots of that field of view with the IVS rules on and we can help you out. Usually just some simple placement adjustments of the IVS can fix it.