All of a sudden today (I have never ever seen anything like this before while modding Skyrim), a large iceberg appeared in one of my cells while playing. It's a dwemer interior, and I have not placed this object here. But that's not the end of it... After going through a few more cells, I encountered a floating Dwarven Sphere along with one of those wallpieces they come out of.. they where apparently linked together. Above these two was a small piece of nordic-ish roof... and it seemed like the entire mesh was not displaying.

As soon as I had exited the game I went to the CK to see if they were there.. and nope. None of these objects was there. I am reloading from the same savegame as I do every time I playtest. I have not used nor modded another plugin file for weeks. I have not placed an iceberg mesh in my mod either, except for a few days after the CKs release, but it wasn't even this mesh I placed and not in this cell. I have placed the Dwarven Sphere along with the wall piece in another cell off my dungeon, but that was almost two weeks ago. I have not poked around with any of these since then.

I decided to do some research on the Sphere thing, because I knew I had copied it from the WarehouseAmbushes cell, which uses nordic style. I'm not sure, but I think that maybe the dwarven sphere thing might have disappeared from that room. The roof pieces are missing in a few places here as well.

What I don't understand is why did this happen in all of a sudden. I haven't touched those things in a very long time... And the iceberg I have no explanation for at all. And WHY are they appearing in two completely different cells.. and why does this happen now?

Very weird..

go to that cell in the CK and press F5.

Pressing F5 in the WarehouseAmbushes cell does not result in the missing roof pieces returning. Pressing F5 in the cells where the iceberg and sphere appeared does not result in them appearing.
The only thing that seems amiss in the CK is the missing objects from the Warehouse. The weird objects that appear in-game do not appear in the CK.

Maybe this has something to do with the last Skyrim update. One of the things you could expect is a brutal change in your load order.

I use only my own mod along with Sounds of Skyrim and Killmove+
I don't think there has been any brutal change in my load order

Go to File->data and select your plugin and click "details". Search for the iceberg/sphere in the list, if you find them, select it and press "del", reload your esp in CK and save.

Will probably work, yes. So I'll try that.

But it doesn't explain how they ended up there in the first place :/

You know, if I fast travel to solitude, I show up with a dragr, very odd. Happens once, guards kill it. Doesn't come back. Wonder if this is the same? I have nothing that modifies solitude in general.