Weird placement on top of other items

What I've found before restarting the game and started writing:
"One side of Colossal Shelf has two weird lines, circles or other shapes on surface that rotates any chest or basket, or smaller item when positioning them, making harder to place."

Strangely, before restarting, I moved Colossal shelf away and it still behaved the same or very similarly when it was close to the rope. After restart I went back to testing and taking screenshots, but Colossal shelf seems to have fixed itself. Only thing is, it (and probably many other items, structures) somehow reacts to surrounding objects, like that rope in a screenshot, or even the ground under the water, as it sometimes follows the same angle(s) above water, a shelf only helps to have a place for items to be.

Also it's not only a Colossal shelf, placing things on various surfaces is weird and most of items breakdance on a surface.