OpenCL: multiple clEnqueueNDRangeKernel() calls

I'm confused about how clEnqueueNDRangeKernel() works when called multiple times. Let's say I enqueue 10 times (for example, with a for loop), each time w开发者_开发百科ith global_work_size = 32. Let's say the kernel takes a global argument that it populates with get_global_id(0).

My question is about the enumeration of the global_id's.

What I expected: The highest-numbered global_id would be (10*32-1)=319.

What actually happens: The highest-numbered global_id is (32-1)=31.

Can anyone explain how each work item is enumerated, step-by-step, as multiple clEnqueueNDRangeKernel() calls are made?

The NDRange space created in each clEnqueueNDRAngeKernel call is independent of each other, the global work item IDs is not consecutive or related at all between each call.