I've got no clue what you're talking about. Could you elaborate? What specifically about civies is off?
One example is that I had set up to transfer 18 Deep Space Tracking Stations from Earth to 3 different planet, 6 to each. In the end one of them had 6, the other one 3 and the last is now stuffed with 21. Very strange... . I though didn't watch what happened all the time; so I can't put my finger on it why and how this happened. I am sure that I didn't mistype the demand numbers... ;-)
I am sending things with the civilians all the time and had a feeling something is off for quite a while now. Automated mines for example I tend to send in blocks of 10. Though I have several colonies with like 54 AMs, another one 32, and so on...
Yes... there is an issue with how the civilians use supply and demand. If you want it to behave properly you usually need to put a supply and demand relationship as 1:1. In you r case first one with a supply 6 and demand 6 and then repeat thing three times after each one is finished.
If I for example set a world to supply 100 mines and then give a demand of 50 mines to one world they can easily end up with 60 mines and not 50.
In my opinion the supply and demand system could perhaps need some love and be better. I would really want to say that put all mines above 100 as automatic supplied on a world for example. Then I could give a demand of 1000 mines on three other planets and this one planet would automatically supply mines whenever they are built but will always retain 100 mines itself. It should work like when you put a cap in minerals.
I see no reason why I need to continually go into a world and set supply and demand once every few months... I usually have a list of worlds I need to set supply and demand on each year and do this on the first of every year. This is work I should not have to be doing to be honest.
I also think that civilians should a bit more randomly chose which demand to carry cargo to. They seem to be very laser focused on one demand before another and I don't actually like this behavior.