Nested grid floats

I try to run floats in 4 nested grid configuration and it’s impossible because always run in nested 0 (mather).
I change Fgrd to 4, I played with differents configurations in Fgrd, Fcoor, Fx0, Fy0, Ftype… and always the same results, only move the floats if the grid is the initial (0).
Can help me?