It’s pretty basic supply and demand. Inflation historically goes up in an economy when a lot of people want to buy stuff, and that stuff is in limited supply.
Workers had cash and stimulus money = higher demand
The pandemic fucked with good manufacturing, and transport = reduced supply
When there is less of something, and people have money, they’re willing to pay more to get their hands on the scarce thing. Companies pay more for chips, or to have first dibs on something from the port, and that increased cost is passed along to the consumer.