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A guess: the due soon styling is applied if the due date is less than 7*24*60*60 seconds from the current time, and the grouping is based only on the date -- so that things like "Due Tomorrow" make more sense. Something starting 7 days + 2 hours from the start of the day today will show up as Due Soon (with that set to 7 days) anytime after 2AM, but won't show up in the Due within the next week until the date of the item is less than 7 days from the date of today.