You can probably go through your audit log to see if there were items created between Dec 4th and Dec 10th to check whether it is behaving as expected.
Wrt sorting, since public ids are incremented for each newly created entity, sorting by creation date is the same as sorting by public Id (at least within a single database).
EDIT: there can be exceptions to this, for example if entities are created with a specified Creation Date which is not the current datetime, e.g via API or custom integration. But generally, entities created on the UI have ids which have the same sequence as creation date.
By the way, is there a particular reason why you would want to sort by public ID?