Turfs sometimes are not displaying their animation properly. Strangely enough - turfs will sometimes show their animation when the client connects / spawns in a location in sight of the animated turfs. But in this case, when the client moves in a way that removes any of the animated turfs from view, the client will be unable to see the animation when they move back to their original position.
Here's a gif that better explains it: https://dl.dropboxusercontent.com/u/10657252/Ocean.gif
And here's what the animation looks like in DreamMaker:
