I don't know if this is a bug or not, but when trying to add items to my shop via my inventory, I kept getting directed back to my inventory and the items weren't moving. It finally clicked that maybe my shop was full so I checked... and sure enough I'm at max capacity. So why isn't the site telling me this?

I get an error when I try to quickstock items into my shop now that it's full, but there really needs to be a similar error message when moving items directly from the inventory.

Up until I gave it up and just bought outright the remaining things I wanted from Keelhauliday I had this problem too. I was Vending with a GA and doing quests and fighting pirates, and this fills up shops super fast.

Very good idea! I didn't even know that it did this but I know it would have taken me a while to figure our what was happening lol