I've noticed this too.
The effects strike me as similar to the effects of another plant that I have observed. My daughter once gave me a Venus flytrap. Within a few days we started to notice an increase in the number of flies hanging around and not just more flies but stupid flies. Before the presence of the flytrap the flies seemed to be more difficult to swat but the flies attracted by the flytrap would just sit there or try to walk away instead of fly. When they did fly, they would fly directly into walls or the ceiling as if they had lost all sense of bearing. I think the effects of the organic compounds released by the flytrap not only attracted flies but either attracted only stupid uncoordinated larger than normal flies or incapacitated them in ways that made them more vulnerable to capture and less motivated to escape.I would guess that not all flies were effected in the same way and the ones that weren't just didn't show up for dinner.
That’s very interesting and a great analogy, thanks.