To be safe remove the amenity from the room before placing a new one.
Text of bug report:
I purchase a Stormglory Typhoon AS version. I placed several amenities.
I had filled the small rooms and wanted to check out some more amenities. The room had the Sellswords' Tavern placed. I placed the Armory which I had purchased earlier. The Store Amenity window showed the Armory twice. I clicked on the top one to Store it. Now the Sellswords' Tavern is showing I need to purchase it again. I tried to logoff and on with the room empty and with the Armory there. It still says I need to purchase the Sellswords' Tavern.