Might be they're dropping scheduled runs of certain cases, and the runs they picked are before or after runs of things that they need to make more of, so those runs can then be extended. Some things on that list probably don't get run all that often.
Changeovers takes time, if they can leave machines set up for more shifts they get more production out of the same machines. Some of the drops make sense, but 6 Creedmoor is a very popular round now and Capstone uses the cases in their own loaded Berger ammo. Might be hoarding their runs to make their own ammo, dropping external sales until they can get a run scheduled again.