I think widespread panic hording of essentials triggered by the other shortages/price increases.
There are some loosely imposed rules that one cannot buy more than 5kg of rice per turn, etc. But I don't see people actively hording things. The long lines are likely because a shop is only allowed to bring in 2-3 customers at once.
This is why moderate inflation around 2% is good because it stops hoarding of money and why inflation above 10% is destructive because people start hoarding goods.