Can't place flooring/wallpaper on my corner room.

Maruru

Greenhorn
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I've got this mods installed, I tried removing them and I can't place wallpaper/flooring on the corner room, also tried placing them on different rooms but they still won't change.
 

Maruru

Greenhorn
If someone could help me with a solution on how to fix it, please it will be highly appreciated. ;;
 
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