When the business has the Subscription Reorder feature on, it works per weekday of your plan (e.g. every Monday you deliver), not per single date. Under "Subscription Reorder - Lock Menu" on My Subscription, each weekday you're subscribed on shows a card; clicking it lets you pick one of your past delivery dates on that same weekday, and its meals are then automatically cloned onto the next matching delivery date instead of you selecting meals fresh each time. Choosing Random Meals instead clears that link for the weekday, so it goes back to not being tied to a prior date.