同时触发不同半径的基于位置的通知

I would like to show user 3 different local notifications as he is coming to exact point. So I set 3 circular regions with same center but different radiuses (500m, 1km, 2km). When I am closing to this point I get all 3 notifications at once. Why is it happening? Did I do something wrong with my code below or is it just function from Apple that shows more region notifications to consume less battery? Can I do this some other way (alert user when he is closing to some point?I would like to show user 3 different local not