Multiple squads shooting me, not each other

Yeah I definitely feel this.

Maybe it has something to do with the positioning?

Possibly making yourself more visible compared to the others, so they might focus you more.

Quick reflex response, as they might believe that the other squad has more HP thus more dangerous. 

Usually I chalk it up to being unlucky or that they didn't really do it intentionally.

But it sucks a lot, and I do wonder how to avoid these types of situations.

Guess it's just better to camp in a building as Caustic then.