Traffic Incidents Outside bounding box shown

This might come across as a rookie question:

While I make a bounding box & keep a zoom level 12 or 13 I get the traffic incidents inside the bounding box but when I keep the same bounding box with zoom level 6 or 7 then I get traffic incidents outside the bounding box. I though regardless of zoom level the boundaries of bounding box should be respected, isn’t it?

Thanks!

Probably you are also getting incidents that are clustered with those inside your bounding box.
If you change the style to night then you should receive unclustered incidents.