Code indent always display 8 spaces even though I set vimrc's tabstop as 4 spaces

• iTerm2 version: 3.2.8
• OS version: Mojave 10.14.6
• Attach ~/Library/Preferences/com.googlecode.iterm2.plist here: com.googlecode.iterm2.plist

What happened:

• ~/.vimrc

set expandtab
set tabstop=4
set shiftwidth=4
set softtabstop=4
set smartindent

What should have happened:

When cat file via item2 it will display code indent as 4 spaces.

My item2 personal preference setting: iterm2-preference.json