Apex legends displays a different name than psn

[Mamotini]

My Psn is mamotini and on all EA games it displays mamotini but on apex legends it shows Marg-V which is an account of my sister that is also an account on my ps4. But even when I'm logging in correctly it displays the wrong name. What can I do to fix this?

Apex players know me as marg-v instead of mamotini because they also see marg-v