Wall outside half bath bowing and separating

[Neal]

Opposite the refrigerator is the wall outside the half bath. The aft side of this wall on the bedroom side is bowing and separating. I tried using a pin nailer twice to resecure it but that's not working. It is "pounded" back in slightly in this photo, it separates about twice this amount.

Anyone else had this and what is the best way to get it properly secured back in place? It's very hard to push in, it's almost like there is "settling" in my house and the wall is bowing as a result.

 

[Buly]

I just had to fix mine at the same spot before we left. The panels do not have any space vertically to allow for roof/ floor flexing or settling under load. So they pop out.
First I used my Rockwell oscillating tool to make a gap between the panel and the floor.
Than managed to squeeze some glue behind the panel edges, and nailed back with finishing nails.
The separation was going around to the bedroom side too.