Weird Geometry on Fluid

So, there’s this weird retangular geometry going outside the piano of my scene:

And I have no idea what’s causing it. There are two inflows over the piano keys, I checked the normals on the fluids, and, well, I just don’t know what to do?

Try clearing the scale and rotation of all objects (Ctrl+A)

Tried that, on all objects, to no avail =/

I would guess that is the boundary of your domain. Just put an outflow on the floor. For obstacles objects to work correclty they must fit, entirely within the domain. Show us a wire frame of your domain.