I had this happen too with a gate I built around an older foundation. Unfortunately I didn’t take pictures, but here are some details:
- Foundation was an older structure made in September I think, it’s a simple staircase going down to the river (north of Hunter’s View and east of the Imperial Highway, in that empty desert stretch, below the big tree on the hill, Skeletor visits us now and then)
- New gate was a massive undertaking encircling from the north mountains around and to the south, closing off our clearing. Made from sandstone foundation and wall, it didn’t actually line up with the foundation to the river but lay over pieces of it.
- I attached some new foundation pieces to the old one to build walls up, and attached a new gate piece to the old foundation.
A couple hours later, the old foundation and attached stairs sort of snapped to the new gate and wall structure in a bizarre way, with stair pieces copied all up the wall and another large section of stairs flipped and attached to the side of the gate facing our base. I kept going, not wanting to deal with it, and after leaving the area briefly, exiting and coming back, it went back to normal and I haven’t had a problem since.
However, my old base from August started slowly deleting my old crafting stations that were sitting on them, until I logged in to find all my chests and all the house decor just gone I saved off a few saves around that, I think one is pre-gate building with a lot of the crafting stations still there. If those are helpful I’d be happy to upload them! I don’t have a save with the gate flipping around all funny, but I wonder if the funny behavior with old structures is all related somehow.