This NCEPT round they used slightly different. numbers for gaining/releasing making some facilities releasing fewer or gaining fewer than the vacancy list showed.
They also added a modifier to the trainee/CPC ratio that might have limited how many a facility could select. No more than 30% trainees.
Then there are the release factors. More people may have had ERRs in, but their facilities could not release, or already released one person and could not get anyone else out.
There also could have been “dynamic decisions” being made that limited movement.