Heroku rails producion enviroment removing css vendor prefixes

Rails
1

I am pushing my code to heroku with a production.rb enviroment file and
when I open the css file that rails has created all css vendor prefixes
have disappeared. May be sass-rails gem is doing something weird.

My css with development.rb development.rb - Pastebin.com

[layout-align="center center"], [layout-align="start center"],
[layout-align="end center"], [layout-align="space-between center"],
[layout-align="space-around center"] {
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
}

My css with production.rb production.rb - Pastebin.com

[layout-align="center center"], [layout-align="start center"],
[layout-align="end center"], [layout-align="space-between center"],
[layout-align="space-around center"] {
    align-items: center
}

I have written to stackoverflow, and rails IRC but I don’t get any help.

What can be happening? Thanks!