HELP PLEASE, Present Value of Future Value

Hello all. I'm doing a PV of FV analysis using both P/E method (applying NTM P/E multiple to NTM EPS, then discounting by cost of equity) as well as the EV/EBITDA method (applying NTM EV/EBITDA to NTM EBITDA, then subtracting away debt, noncontrolling interest, adding cash, etc. to get to equity value, then dividing by share count to get price, then discounting).

However, the P/E method is giving me a significant discount while EV/EBITDA method is giving me a significant premium. Any idea what could be going on?