This rule compares the amount of data read by the kernels to the amount of data written by the host to off-chip global memory. This rule catches values that are deemed to be too small.
The data read by the kernel from DDR memory is less than the amount of data written by the host to the device. This creates an undefined behavior.
The host is potentially writing too much data to off-chip global memory, or the kernels are not functioning correctly. Consider changing the user code.