After 10 days without returning home, I arrive there to find all display cases opened again, that was ok as the content where still there and they just needed closing. What is a problem, is used weapon racks no longer allow me to place anything after removing what was in its place.

I have the same issue with display cases opened when I return to me War-House (lakeview Manor).

Thanks for sharing a possible bug with the weapon racks , I have not checked on this . I only keep regular weapons on the Racks just for the look purposes.

The inactive weapon racks should return to normal once you reload the room.

^^ This, Thanks