When I run collectstatic some (not all) files will be post-processed even though they are unchanged. Not sure if this is a bug or expected behaviour.
user> $ manage.py collectstatic --noinput
Post-processed 'admin/css/dashboard.css' as 'admin/css/dashboard.4898e2e9983d.css'
Post-processed 'admin/css/fonts.css' as 'admin/css/fonts.cc6140298ba7.css'
Post-processed 'admin/css/base.css' as 'admin/css/base.ba3dc2f88fc5.css'
Post-processed 'admin/css/login.css' as 'admin/css/login.a846c0e2ef65.css'
Post-processed 'admin/css/changelists.css' as 'admin/css/changelists.b1b060f73d37.css'
Post-processed 'admin/css/rtl.css' as 'admin/css/rtl.e024aaf6df25.css'
Post-processed 'admin/css/forms.css' as 'admin/css/forms.70b858e61281.css'
Post-processed 'admin/css/widgets.css' as 'admin/css/widgets.a7251c097987.css'
Post-processed 'debug_toolbar/css/print.css' as 'debug_toolbar/css/print.85b39f60bfe8.css'
Post-processed 'debug_toolbar/css/toolbar.css' as 'debug_toolbar/css/toolbar.705f69e5cc65.css'
Post-processed 'custom.css' as 'custom.96d7e992b843.css'
0 static files copied to '/srv/myproject_static', 90 unmodified, 11 post-processed.
user> $ manage.py collectstatic --noinput
Post-processed 'admin/css/dashboard.css' as 'admin/css/dashboard.4898e2e9983d.css'
Post-processed 'admin/css/fonts.css' as 'admin/css/fonts.cc6140298ba7.css'
Post-processed 'admin/css/base.css' as 'admin/css/base.ba3dc2f88fc5.css'
Post-processed 'admin/css/login.css' as 'admin/css/login.a846c0e2ef65.css'
Post-processed 'admin/css/changelists.css' as 'admin/css/changelists.b1b060f73d37.css'
Post-processed 'admin/css/rtl.css' as 'admin/css/rtl.e024aaf6df25.css'
Post-processed 'admin/css/forms.css' as 'admin/css/forms.70b858e61281.css'
Post-processed 'admin/css/widgets.css' as 'admin/css/widgets.a7251c097987.css'
Post-processed 'debug_toolbar/css/print.css' as 'debug_toolbar/css/print.85b39f60bfe8.css'
Post-processed 'debug_toolbar/css/toolbar.css' as 'debug_toolbar/css/toolbar.705f69e5cc65.css'
Post-processed 'custom.css' as 'custom.96d7e992b843.css'
0 static files copied to '/srv/myproject_static', 90 unmodified, 11 post-processed.