This started on my very first day on Pokemon. Somehow, my first slot pokemon (initially a pidgeotto) became a Charmander with the same IVs as my starter Charmander, and same nature, just with none of the levels.
Few hours later, the pokemon on my first slot (Arbok) became a Pidgeotto, the one I lost before. Now, the pokemon in my first slot (Raichu) became the same Arbok I lost before.
This is my first day, and it is quite demotivating to have this happen as its very confusing