Every time I leave my house, the walls revert to the Folk Medium visual, even though they are labeled Folk Dark when you go into Customize. I have to change from Folk Dark to Folk Medium, no change visually, then change back to Folk Dark. And then I leave and come back and have to do it all over again 
Same issue here. Folk dark doesn’t stick, nor does it work with the “change all walls” button. Also the only way you can change it back to folk dark from whatever it reset to (usually folk medium) is to change each wall to something completely different, like silvermoon, then back to folk dark.
Also, the decor storage limit is a gamebreaker and doesn’t work properly regardless, but that’s a different (super-annoying) housing issue/bug.