Only reason I can think of is each case processor is assigned to a batch of applications. For instance, officer x has not been in the office for long time I guess due to covid so his assignments are just sitting on his desk until he is back to the office. Nowadays, we see February applications are getting aor makes me think the responsible person is back to work... So then one can say if the person is not in the office, why he/she were given assignments, I really have no idea my friend. This is just my assumption.