I hadn't played this sim in awhile so I don't know whats going on here, my sim has mopped up twice and the puddle in the bathroom next to a window keeps growing. Does anyone know what in the world is ...
I had this exact same problem as well. It is not a ghost, and nothing is broken in the bathroom.
I was playing my Sim, and whenever I would visit the Frio household, the downstairs bathroom kept filling up with puddles if they tried to mop them up.
I switched households to play the Frio's, and deleted all their plumbing in that bathroom. Since then it hasn't happened. Nothing was broken though, and I'm positive.