There seems to be a number of actions that will fail to update the used volume of both inventories when something is moved between them.
I only know one for now but there may be more:
- having an item merge into a multi slot on transfer
## example: put orange hull in your inventory
## put orange hull wedge in a chest
## transfer orange hull to the chest, or the wedge to your inventory so it would merge into a multi slot
## capacity used doesn't update on either side