Inappropriate spawners appearing in strange places

[Joria]

I was just recently placing some of my builds, which I know were spawner free, on empty lots in Barnacle Bay.  When I went to buy something in buydebug, I suddenly saw dozens, literally dozens, of spawners all over the place including inside my house.  I know for a fact I did not use any spawers, and certainly not fish inside the living room!  So I went into different lots where I had placed builds and some had lots of weird spawners and some were just blank except for maybe the occasional flower spawner.  Does anyone know why this happens, can it be prevented and will these spawners now stick with those builds?  I used the hammer on them but am nervous about them still being there.

[Trip]

Were there alchemy stations on the lot?

[Wiry]

Were there alchemy stations on the lot?

Alchemy doesn't cause Fish spawners to appear, trust me, I've checked.
I've placed Alchemy labs and had insects spawning  on my Sims' front porches, but never fish

[Trip]

Yeah, I have no idea where the fish ones could have come from.

[Joria]

No alchemy station. We're talking so many spawners you almost can't see the ground.  Some were floating in the air, some were buried underground with one marker above ground.  I had to build a basement to get at the underground ones to delete them.

[MeestorMark]

Had you ever placed other lots in this same place before placing your current lot? If so maybe those earlier lots had spawners on them. They don't delete from a lot when you use the bulldozer to return a lot to empty. I always have to go into edit town and then use build/buy on the lot with buydebug turned on to remove them. When I am placing community lots that have spawners on them in edit town, if the game places the lot in a position where I want to rotate it, the spawners multiply with each rotation too. So I do the same thing to remove all the extra spawners through build/buy.

Since Supernatural, I have noticed any residential lot I am playing with sims with the gatherer trait have spawners show up on the lot (when I turn buydebug on) that I certainly never placed myself.

[Joria]

Had you ever placed other lots in this same place before placing your current lot? If so maybe those earlier lots had spawners on them. They don't delete from a lot when you use the bulldozer to return a lot to empty. I always have to go into edit town and then use build/buy on the lot with buydebug turned on to remove them. When I am placing community lots that have spawners on them in edit town, if the game places the lot in a position where I want to rotate it, the spawners multiply with each rotation too. So I do the same thing to remove all the extra spawners through build/buy.

Since Supernatural, I have noticed any residential lot I am playing with sims with the gatherer trait have spawners show up on the lot (when I turn buydebug on) that I certainly never placed myself.

That's really interesting and helps a lot.  Some of the lots I placed did have other lots placed on them before so that might be part of the answer.  The other part though is they multiply when you rotate!!  I often do this three or four times to make sure I like the placement.  Will now check each and every lot with buydebug BEFORE I place a lot on it.  I imagine you should probably put a basement on the lot to double check hidden buried ones?  Thanks so much for the help.  It really answers a lot for me.