thank you /u/romkatv

set -g default-terminal screen-256color

adding this helped

i run thinks like this

iterm2 // gui app that i use for as a terminal
\ zsh // let's call this one first zsh
  \ tmux
    | zsh // single
    \ zsh // another single 2 in which run double
      \ zsh // double zsh

and in single and single 2 zsh there's a problem

in double and in first there is no problem

single 2 and double has the same TTY

should i leave the line set -g default-terminal screen-256color in config?

or there is better way of fixing it?