rails: Wrong file path to precompiled asset files

I precompile my assets and use following function to render html:

= stylesheet_link_tag "frontend/application", media: "all", "data-turbolinks-track" => true
= javascript_include_tag "frontend/application", "data-turbolinks-track" => true

Sometimes those methods generate correct html markup (assets are in assets folder and have fingerprint in filename):

<link data-turbolinks-track="true" href="/assets/frontend/application-64cf06dd4d2386f145e00844fed60d28.css" media="all" rel="stylesheet" /> <script data-turbolinks-track="true" src="/assets/frontend/application-447281961c979f73e944369c4b832fd8.js"></script>

But on production (Heroku) rails sometimes (50%!) generates html markup like this (folder structure is not OK)

<link data-turbolinks-track="true" href="/stylesheets/frontend/application.css" media="all" rel="stylesheet" />
<script data-turbolinks-track="true" src="/javascripts/frontend/application.js"></script>

Any idea what could be wrong or how can I fix/debug this? The strangest thing is because it behaves kind of randomly 😦

Below is my production config.

  config.assets.enabled = true

  # Settings specified here will take precedence over those in config/application.rb.

  # Code is not reloaded between requests.
  config.cache_classes = true

  # Eager load code on boot. This eager loads most of Rails and
  # your application in memory, allowing both thread web servers
  # and those relying on copy on write to perform better.
  # Rake tasks automatically ignore this option for performance.
  config.eager_load = true

  # Full error reports are disabled and caching is turned on.
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  # Enable Rack::Cache to put a simple HTTP cache in front of your application
  # Add `rack-cache` to your Gemfile before enabling this.
  # For large-scale production use, consider using a caching reverse proxy like nginx, varnish or squid.
  # config.action_dispatch.rack_cache = true

  # Disable Rails's static asset server (Apache or nginx will already do this).
  config.serve_static_assets = true # rails_12factor gem will sett this to true on heroku

  # Debug mode disables concatenation and preprocessing of assets.
  # This option may cause significant delays in view rendering with a large
  # number of complex assets.
  config.assets.debug = false

  # Compress JavaScripts and CSS.
  config.assets.compress = true
  config.assets.js_compressor = :uglifier
  config.assets.css_compressor = :sass

  # Do not fallback to assets pipeline if a precompiled asset is missed.
  config.assets.compile = false

  # Generate digests for assets URLs.
  config.assets.digest = true

  # Version of your assets, change this if you want to expire all your assets.
  config.assets.version = '1.0'