Thank you so much!! I have so little knowledge of coding but I'll try it
Best of luck. I know these things can be difficult. The main point of this suggestion is that you need to have some variable that remembers all of the items' locations. Then, when you switch to the room, look through all the remembered item locations and move the items to those locations so that they show up where the player put them.
You also have to make sure to update the remembered item locations either right before switching rooms, or every time an item is moved.
You'll get there!