Yes, there should be 2 boxes. Did you already get the full amounts for the 1st and 2nd rounds? Are you Single or Married? Any Dependents under 17? 2,400 could be the first one for Married Joint. You might have entered the wrong amounts received in the wrong box.
The 1st Stimulus payment was 1200 (2400 joint) and 500 for each dependent under 17.
The 2nd round was 600 per person.
