admin_print_styles incuding $_SERVER[‘DOCUMENT_ROOT’]

You seem to be facing a similar problem to this: Some plugins adding full server path after url (with custom wp-content folder)

My first suggestion is to examine the value of WP_CONTENT_DIR and see whether it’s what you expect. Not sure how the path could be getting mixed up, but I bet if you compare notes with @Craig about your respective server environments, then the cause might show up.