The latest Steam gifts deposit trade offer was completed on 3rd Jun, which the items should be usable on 10th Jun since Steam imposes an 7 days untradable time period for Steam gifts owner changes.
If any manual adjustments are needed they have to be done after all items in your shop inventory are tradable.
That's not what I'm talking about. I initially had 43 items listed, and the buyer wanted to buy them, but the deal fell through. After that, I tried to list the same item again, but it now shows 36 items instead of 43 (the bot shows them all as tradable when viewing them).