The complex that dissolves in water is

$\left[{\mathrm{Fe}}_3\left(\mathrm{OH}{)}_2\right(\mathrm{OAc}{)}_6\right]\mathrm{Cl}$ is a coordination complex containing iron ions coordinated with hydroxide and acetate ligands. When dissolved in water, this complex can undergo hydrolysis and dissociation. 

So, $\left[{\mathrm{Fe}}_3\left(\mathrm{OH}{)}_2\right(\mathrm{OAc}{)}_6\right]\mathrm{Cl}$ dissolves in water. Rest of the complexes form precipitate.