Why is apex always giving me lifeline when somebody takes my character?!

From personal experience, it does that because you have a lot of kills for her.

What i mean by that is this:

i have five main legends

Lifeline (237 kills)

BloodHound (86 Kills)

Bangalore (53 Kills)

Mirage (38 kills)

Caustic(36 Kills)

if i want to choose Bloodhound but someone chooses them before me it'll automatically put me on Lifeline. If i wanna go for Bangalore but she gets taken i get with either Bloodhound or Lifeline etc etc