Issue on dashboard, admin, edit user after upgrade to version 8 from 7.12 (perhaps css issue?)

After upgrading to version 8.2.2 from version 7.12, we have encountered issues with pages seemingly seem to be missing css - altho no errors relating to this in the console. (see attached photo)

File permissions are set correctly.

I did notice two issues in the console relating to the javascript, however these relate to the .htaccess file in the legacy folder. Resolving this issue did not resolve the overall issue. Any help is much appreciated.

Go to your admin user and click save at the bottom. Weirdly fixes the issue