CKAN Version if known (or site URL)

2.8.0

Please describe the expected behaviour

We have a CKAN site that should be accessed via http://192.168.183.128/data
The expected CKAN URL should be http://192.168.183.128/data/<ckan_page>

Please describe the actual behaviour

When viewing some of the CKAN pages in a browser, the url root is repeated.
Therefore the site cannot be reached.

The browser tries to access http://192.168.183.128/data/data/<ckan_page>

Examples are the login, logout and admin pages
http://192.168.183.128/data/data/user/login
http://192.168.183.128/data/data/user/logged_out_redirect
http://192.168.183.128/data/data/user/ckan_admin

Once logged in, the URLs are correct for dataset, organization, group etc pages.

What steps can be taken to reproduce the issue?

production.ini:
ckan.site_url http://192.168.183.128
ckan.root_path = /data/{{LANG}}

ckan_default.conf:
WSGIScriptAlias /data /etc/ckan/default/apache.wsgi

datapusher.conf:
WSGIScriptAlias /data /etc/ckan/datapusher.wsgi