Unresolved Perimeter printed correctly, object totally off

Good afternoon,
I don't know what's happened... I used for testing the same object before printed correctly but not they aren't.

My Robo3D prints correctly the perimeter of the object but when starts to print the object itself, it is like it does that with some millimeters higher than the bed and the filaments go around with the extruder.


Repeat... the strange thing is the perimeter is printer perfectly... what can be happened?



Thanks,