drecko critter trap

I have my critter trap inside my starvation ranching drecko stable, usual stuf, so i can replenish my main stable, whenever critter dies, it is automated to arm the trap when critter sensor detects 7 or less critters in stable, but the thing is i have seen 2x now that critter trap trapped drecko who was on the roof, and not the one who was on the floor, i had my whole colony on high priority for ranching, and +7 on all drop offs, but because my trapped drecko was in the air my whole colony was stun locked, actualy standing still and their top priority was move the critter that cant be reached so they stood still until rest schedule where they went to toilet, eat, sleep and they ware stun locked again for the rest of the turn