How do you pass order 23 in imagine interior designer DS?

If you look at the at the base board put it half way but then add in the top base board half way leave it like that then look at the base board it has moved down so its not half way move it to half way then change the tones If you look at the at the base board put it half way but then add in the top base board half way leave it like that then look at the base board it has moved down so its not half way move it to half way then change the tones