Not sure if this is a bug or working as intended, but when I try to move pottery into the Trading Center, the stockers will go out to my markets and pull the pottery that the grocer stocked there versus getting the pottery from the storehouse across the street or the Pottery Maker diagonally from the location.
For reference, I had about 300 pottery stored in the storehouse next to the Trading Center. I asked to transfer 100 to the trade center, but they decided to walk the distance to get the items from markets.
Seems counterintuitive and buggy, especially since it means the grocer is going to spend time restocking that all over again.