There's no need to change it.
You think you need to because some other sites do and because it seems to make sense if you work out, you need more food to maintain the same deficit, right?
But Spark already accounts for your workout in the "Calories to burn per week" goal. As long as your weekly workouts are meeting that goal (and change the goal if it's not correct), then your intake range is appropriate for your level of workout.
Your body doesn't work on a 24 hour kill switch. If you work out hard today, it might mean you're hungrier today. It might also mean you're hungrier tomorrow. Maybe you want to eat a little higher today because you know you're going to work out hard tomorrow so you want to fuel that.
Don't think daily - think weekly. :)
Deb, in New Zealand