Smells from my growbox

Hi.
So i checked it all and i have no idea anymore.
Never had that before...
Carbon filter is new, big for the room, fan works perfect, under pressure is good, there is no leaking in duct or somewhere else..

So why i smell a bit of cannabis in my room ? Is 1x1 meter tent and with 5 ladies...nothing new from my experience, but those smells i have no idea.
Oh...humidity is 35-45%, temps are not over 26C...

Any idea ?

Send a picture of setup how your intake fans , they coming in low and exiting high? There are holes on tops of tents too - check it… is it end of flower?

They sleep now...everything is horizontal high inside the tent. Not much duct tape, filter is straight on fan and all together is so long it exits right through the hole. Intake air comes from the bottom yes.
I'm in 7th week...

There’s a # on fan of how many cubic feet it can evacuate… perhaps yours is low but also some genetics are super stinky lolol

360...as it was always good for this size tent. Filter looks good cloth is not dusty or anything.
Not sure, but i think it could be filter malfunction ?
Supplier saying it could not be...but...i have no more ideas.

Its like this...