sims 4 build broken

@minkijinki Sorry for your frustration! Your post was moved to TS4 Game Information to more specifically address your question.

I would suggest that you start with re-tracing your walls, each one to completion per room, one at a time. When you get to the end of the last wall section where it completes the 'circuit' to attach to the beginning point of that wall the room should complete and add it's floor and ceiling (you will only see the floor unless you go to the next level up, but the ceiling and floor should complete themselves when you finish 'drawing out' that wall with the "wall tool". Or you can do it with the "room tool" (makes a square/rectangular area as you drag). If the rooms will not complete that way you will need to try a game repair, as the mods/cc that you had in before may have left residual damage to the game's code, so I will post this first for you to try, then I will add instructions in a few minutes about how to repair damage the mods/cc may have left.

Repairing the game:

• Exit your game then exit Origin. Delete the mods folder and the localthumbnailcache.package file in your 'The Sims 4' folder and restart the game and so that the game will re-create the folder.
• Then run a game repair [ Open Origin, click 'Game Library' then right-click Sims 4 > Repair Game ]. After that, please see if the issue has stopped. 
  (If It fixes the situation you can re-add your mods/cc one at a time to see if one was conflicting with the function/causing the glitch - but do not re-add the old config file from the old mods folder, as it is possible for it to have become corrupted also.)

Please let us know how it goes.