Do you have enough logsitics points the entire way? No bottlenecks? Do you have enough supplies in storage for the Zones and Units before you hit end-turn
Oh, btw where is the Railhead or station where the stuff is unloaded? Units can not draw from Raillines directly.
From his image, it looks like he's using sealed road supply with plenty of trucks and no bottlenecks. We can't tell where the SHQ is, so there may be bottlenecks off-image. Also, we can't tell if the zone's SHQ has any food stored up.
Yeah, the SHQ figures can be missleading as they tell you the stocks after production and retrieval - wich can not be delivered. A lot of people got confused by it showing something, not realizing it dropped to 0 during the supply phase.