Nightclub Warehouse Technicians not getting goods

[billions]

So I have 3 MC businesses and 3 Technicians, I have assigned each to one of the 3 businesses. I filled supplies in every business, obviously they started producing stock. After some time supplies have run out, I sold all the stock from all 3 businesses and I repeat that process since I play solo and I can't make bigger sales. After about 3h of playing I realized that those technicians have not collected anything. So I did the process one more time and still nothing. I got pissed off and quit the game. Much later I logged in again to see if that was maybe some bug but still nothing. So I just went on with the process of buying supplies for each business, doing vip missions and selling my meth, cocaine and cash. And still nothing. Warehouse is empty. This isn't right, I know it takes long but surely not more then 5 hours to generate at least one thing.
Before someone asks - Yes the technicians are assigned. Businesses are on, obviously production is going. I tried to restart production and I filled supplies everywhere, left my PC on and just went afk, I woke up, still nothing in warehouse. I think in total I was waiting about 10 hours in last few days. 10 hours of almost non-stop production in MC business that is. 
Any ideas?  

Edit: Oh and sorry for my english if it's bad. I'm just learning, not sure if I made mistakes. I hope what I just said makes some sense. 

Edited September 3, 2018 by billions