Mightyamber

Hello, my in-game name is Argeen. Please help, I evolved my pidgeotto to pidgeot on level 36. Then my internet went down and forced me to exit game. But went I log in, the game turned my pidgeot back to pidgeotto. How do I evolve my pidgeotto again? Do I need to de-level it? Please help! My ID : 77458656 Pokemon : Pidgeotto lvl 36 Server : Silver