The measurement is off when you just have topped off, so don't rely on the gauge to "measure" what you add, the level would change next time you drive anyway (which you just witnessed btw).
When the car say add 1 qt, just add exactly that. The sensor triggers when the car needs exactly 1qt to get back to max. You should not top off as long as this "add 1qt" signal does not appear (as there is no reliable way to not overfill, then).
Since you did add 1qt total, you have not overfilled and you are fine
Again, it is unlikely you are burning oil at this mileage, but this level of oil "consumption" is abnormal, you probably have a leak somewhere, you should do the flashlight inspection.