Do you have this in your ProductsController, or if absent, ApplicationController?
layout "application"
You’ve got a pre-asset pipeline <%= stylesheet_link_tag :all %> somewhere, which normally includes all stylesheets in /public/stylesheets, but it’s telling asset pipeline to look for a file named all.css.
Since <%= stylesheet_link_tag :all %> is clearly not in your application.html.erb layout, some other layout is being rendered. Hunt it down, and/or ensure your controller(s) are calling the correct layout.