<p>I don’t have a certain answer but here’s my guess:</p>
<p>Admissions officers probably only read the Common App for that portion, and their systems probably have a way of verifying that the scores entered on the Common App exactly match those reported by the CollegeBoard of ACT. And if one makes a mistake, that just proves to a college that the student is careless. And if one reports a sore higher than what the CollegeBoard/ACT sends, then it proves the student has lied.</p>