Missing object when rendering using OPENCL GPU and CPU render

Question

I'm new in Blender, so I tried to make an animation following youtube tutorial.

I have problem when using OpenCL for rendering

Some object is missing and the physics on the object is not working. It should be like this (using CPU only/None):

but the result is like this:

There is only one cube appear and not falling.

what should i do?

thanks