Fence displacement after being placed

I fenced an area for my 12 stone storage boxes, it started normal for a period but suddenly one of the stone fence posts right next to the cook’s house displaced along with the stone long fence directly connecting it for no reason, also the stone wall lantern attached to that long fence vanished into thin air.

I tried repositioning both but only succeed with the post, the long fence was listed as in use and prevent me from moving or packing it so I had it erased, after that I find the space that the deleted fence originally occupied before displacement would never accept anything, all hearthlings would not ever answer the order of moving things to the aforementioned particular space.

I read through some similar posts in this forum but either they were too old or had no solution available, that’s why I opened this post.

Here is a screenshot of fence in question: