Hi,
I wrote with steam on the discussion board of steam developers
Here the like for players with group access :
https://steamcommunity.com/groups/steamworks/discussions/0/1729837292624082311/
The valve employe wrote that items have a 3 days trade and market restriction and 3 days after dropping they should switch itself to tradable and marketable.
I don't know why the older items have no restriction and the new items have it but it seems to be normally an default. Pls write me if they don't change that i can again write to valve to fix it.