expand tab is not working on vim

I set the expandtab option to on, but still I don't get spaces when I click tab, but I get actual tab. This is how I set it: set expandtab set shiftwidth=4 set softtabstop=4 First I thought as this question says that a plugin is override it, but I executed: :verbose set expandtab? and indeed I get that last set is the line in my vimrc how can I solve it?