[NOT BUG] Columns are displayed where they are not actually placed
First, I apologize that my English is bizarre (English is not my mother language).
Issue
I built a house (as a residential lot) and decorated its outer walls with columns. Then, I uploaded the house to the gallery and downloaded it onto another lot. When I looked inside of the house, I found that inner walls are also decorated with columns. However, I never place any columns on the inner walls. This problem occurred when I made a kind of sunken rooms (by deleting foundation and create a sunken area on the floor), and there is no floor (which is not sunken) between the walls and the sunken area.
In order to clarify whether it is just some kind of mistakes or not, I built another house on a different lot and duplicate the same design with the house which I found the problem. The result is that the same problem did not occur. The only difference between these two houses is that I did not upload the latter one to the gallery and download it.
I attached a photo to show my problem. The columns which are encircled by red line are not actually placed on the inner wall in the build mode. However, they are displayed on the inner wall, and the system seems to think that they are actually placed (I could not place objects that overlap with the columns).
Mod/CC
I use no mods or ccs.
Expansion packs
I installed Get to work and Spa Day.
Occurring since
I realized this problem after the patch 1.14.49.1020 is installed.
System
Windows 10 Home (64 bit)
CPU: Intel(R) Core(TM) i7-3740QM CPU @ 2.70GHz
GPU: GeForce GT 650M