A little bit of problem of multiBoxTraceforobjects

Hello, everyone!

I have a problem about node multiboxtrace. I use this node to detect vehicles in a region and store them into an array. But problem is, when I put one vehicle in this region, this boxtrace will detect 9 elements with same object name and store them into array. I’m pretty confused. This node always detect one vehicle 9 times.

Node for each loop will run 9 times when there is only one vehicle. Does anyone can give me help?Thank you.