What inspired you to apply to so many schools, when the average applicant lists ~14? That might be your answer.
Are your MCAT subscores balanced?
Did you challenge yourself with a rigorous course load and challenging classes?
Did your postbac (if applicable) include sufficient course credit (30+ hours)?
Any unexplained gaps in your education?
Any teaching, clinical volunteering or job?
Any possible red flags on LORS? Did you use a committee letter if it was available?
Any past institutional action or legal issues?
Did multiple in-the-know readers approve your Personal Statement?
Does the PS have undertones of entitlement?
Did Secondary essay quality match the PS?
If stats are on the lower end, did you fail to include DO med schools on your application list?