VIM1 NavigationBar View

Hi Everyone,
SOC : S905x VIM1
Android version : Android 9
Android Orientation : Portrait

I enabled the Navigation Bar for the Back button and Home button.
but I have a problem when the back button was pressed. The back button background is not the same as the Home button. how to solve this solution?

Navigation Bar Back Button and Home Button

When Press Home Button

When Press Back Button

Please help us to resolve this issue.
Thank you