Hasta La Motion!

I ran into a strange problem with Maya Batch rendering!
I am trying to render a beauty, depth and a motionvector pass of a fluid simulation.
The fluid simulation is converted into polygons.
I also made different render layers for the beauty, motionvector and depth pass.

Now heres the problem:

When i batch render a single frame of the 3 renderlayers everything works fine. I get my 3 passes and they look how i would expect them.

However, everytime i try to render a sequence, every frame of the motionvector pass and the depth pass looks exactly like the first frame of the batchrender process.

The beatypass however comes out like its supposed to be.

I already tried to cash out the fluid polygon geometry, but that doesn’t work eather, because the cashed geometry looks totally weird.

By the way:

The beauty pass is a volume render of the fluid.
I converted the fluid into polygons to render out my depth and motionvector pass.

Anybody got an idea how i can fix this Problem?

Thanks in advance.

Greetings Braggart