Posted by twilit

It's more than likely not just your lobster pet...
Have you tried placing any other furniture item in the same room?
Does that room already have tons and tons (about 600ish) of furniture pieces?

Awhile ago, I had a similar problem where I couldnt add any more furniture to my outdoor level of GH (I had between 600-750 furniture items). The furniture would disappear and not be replaced in inventory. Dusty investigated and couldnt find anything in the coding that could cause this.

So i just have to be cautious where i put furniture now.