Game selects party members without being told to.

[Phil5000]

Hi guys. I'm on the PS4 and have this annoying issue where the game selects either a single party member or the entire party without me telling it to. It happens when I leave the group to scout around with my main character. I make some kind of action, pick something up, kill something or whatever and suddenly the whole group has been selected and when I move my main character again the whole group moves. It is annoying when I've positioned the group members carefully in ambush positions, then I accidentally move them.

 

Is this a bug? Is this an option I can turn off?

 

Thanks.