Midfielders count in training window

I have dmc/mc and mc/amc but they not counted as midfielders in training window. Why? Same with aml/ml. Is this some kind of glitch?

Let's say there. I selected all my midfielders + attackers with ml/mr but noone of those were counted as midfield players in training section. I dont get this.
Attachment 140768

Just put some possession training and they will be counted as midfield