Why did Zeus want to distrupt the seas when Odysseus leaves Calypso's island?

It's not Zeus that is disrupting the seas after Odysseus leaves Calypso's island; it is Poseidon. Athena went to Zeus to ask for his help to get Odysseus home and Zeus agreed that he would allow Odysseus to try and get home. Poseidon, on the other hand, hates the Greeks and especially hates Odysseus because he killed his son the cyclops, Polyphemus.