tame puffs getting out of stable / getting stuck in door

I cant seem to find a way other than using transit tubes to stop the puffs from either getting out or trapped in the closed door, when the dups are CONSTANTLY going in and out to pickup the tiny little gram piles of slime even though i have sweepers in there.

I have tried to let it go only 1 way, but then the dups cannot get in there to groom the pufts.

I am not sure if this is more of a suggestion issue to make the ai better, or if the critters are getting threw the open door set on auto use cause they tend to hang out near the doors.

in my setup bellow, the 2 blocks missing at the bottom were where the door was they kept getting stuck / escaping from.

In the process of removing the doors now and putting one at the top where the O2 is collecting, thinking they wont go up there and stay in the PO.