It sounds like some colleges -- most notably the Naval Academy -- use an unorthodox approach in counting how many applications they receive, which has the effect of boosting the school's selectivity rank. Using the unorthodox approach, the Naval Academy claims it admits only 7.5% of applicants, but using a more traditional approach, it's admissions percentage is actually 24.9%.
http://www.washingtonpost.com/local/education/naval-academy-other-colleges-at-odds-on-when-an-application-counts/2011/12/22/gIQAB4DBLP_story.html
The U.S. Naval Academy received 19,145 applications for the class that began in fall and accepted 1,426. Its admission rate was 7.5 percent, one percentage point lower than Princeton’s. Or was it? Academy leaders acknowledge that only 5,720 of those applications were complete. The rest, more than two-thirds of the total, were partial applications that never reached the university’s admissions board and were never seriously considered. ...
Academy officials say there is good reason for unfinished applications. ... But the school’s unconventional approach puts it at odds with convention in college admissions. The admissions community has gone to great lengths to define what does, and doesn’t, constitute an application so that colleges cannot game the system. The appearance of selectivity can give a school an edge over its competitors. The accepted definition, embraced by the federal government and collegiate rankers, states that an application should count only if it is “actionable,” meaning the applicant has provided enough information for the college to make an informed decision.