Its definitely a bug. I've reported it since the very first patch.
Basically in some playthroughs, If I recruit Gale but leave him at camp and then later in the game fast travel to camp from Blighted Village, Gale attacks me. If I fast travel to anywhere else first then fast travel to camp, Gale does not attack me. There is something wrong with going to camp from blighted village in some playthroughs.
I can literally reload any save past blighted village, fast travel to blighted village then go to camp and he will always attack me. I can reload the save, fast travel to roadside cliffs instead then go to camp and he doesn't attack me. Reputation doesn't matter as it happens when he is high reputation too.
These are the steps to reliably reproduce the bug:
1) Start a new playthrough
2) Recruit Shadow Heart
3) Recruit Astarion
4) Recruit Gale
5) Complete the fight at the grove
6) head straight to Blighted Village
7) Kill the goblins
8) Unlock Blighted village Waypoint
9) Talk to Gale and tell him to wait at camp
10) Quick Save
11) fast travel to camp
12) Gale attacks you
--
13) Reload the save
14) fast travel to Roadside Cliffs
15) fast travel to camp
16) Gale doesn't attack you
Oh thats good to know. So basicly its tied to the blighted village somehow? 🤔
