[Missing Nidorina]

it is thank you

 

[Missing Nidorina]

Hello, I logged off with a level 26 Nidarina and a level 23 Charmeleon (My starter). I logged back in and my Nidarina, who was in my first slot, became a duplicate Charmander. 
My Nidorina had Headbutt, Posion Sting, Double Kick and Bite, I don't remmeber the nature but I believe it was adament. My actually starter Charmander/Charmeleon is in my number two slot. 

 

 

[Pokemon keep converting to others]

I see there have been others with the same problem I have been having. I logged off with a level 26 Nidarina and a level 23 Charmeleon. I logged back in a few hours later and my Nidarina in my first slot became a level 11 Charmander. 

My Nidorina had Headbutt, Posion Sting, Double Kick and Bite