I recently purchased strangerville and in build mode 2/3 of the categories are still yellow saying new items but I’ve been through them and won’t change now. I’ve tried repairing my game anything else...
It may be swatches of items you haven’t used. This happened after City Living was released and it was caused by the fan mail pile, each swatch was marked as a new item so the only way to get the clutter icon to stop showing new items were still available was to place the fan mail, run through all of the swatches and then delete it.