@ju1ka I believe this is the same as this issue. However, I would like to take a closer look at the house in the video, as it is weird that it's happening on the one side and not the other. Is it available on the Gallery? If not, would you consider doing so (just name it "Test Bug" or the like)?
Edit: actually, after reviewing the issue, I don't need to see the house. It sounds like it's the exact problem:
"There is also a new flavor of this bug that comes along with half walls. Using half walls one tile away from an enclosed wall space also causes the glitch, but it will only show up on the left and back sides of the lot; it does not occur on the front or right sides. Further details and images available on pages 28-29 of our Build Mode Feedback thread here."
I'm going to go ahead and merge this with that thread.