These settings, units per job and global limit, are only used to calculate number of parallel jobs to submit at a time. Based on your input, ls-opt will calculate 16/8=2 and submits 2 jobs in parallel. The actual number of cpus used in the solver should be defined in ls-dyna solver command, for example, add ncpu=8 in solver command (for smp) or -np 8 (for mpp). LS-OPT has no control over the cpus used, it will simply run whatever command you have defined in stage solver command section.
/path_to_lsdyna/ls-dyna_smp_d_R13.exe ncpu=8
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