Apparently the loot and fort level errors introduced on saving and reloading haven't been fixed (per report in link below). That makes the game still rather cumbersome to play for a lot of people. :-/
https://forum.paradoxplaza.com/forum/index.php?threads/2-7-whgq-all-loot-protected-by-fort.1003824/
https://forum.paradoxplaza.com/forum/index.php?threads/2-7-whgq-all-loot-protected-by-fort.1003824/