sprite second character wont flip left

Hi guys
i have a question
I’m creating a 2d platform game with 2 characters moving simoultaneously
it is similar with this one (https://www.youtube.com/watch?v=2nzzEYZ-l90) but in 2d with paper flipbook
i’ve created a base character then the 2 child characters and for both a player controller.
inside the player controller one ive created all the movement input for both char( first possessing them). and everything is all right…the only thing is that the second characters wont flip left…
any suggestion?