Re: Multi-Site and BP
Yup, those are abnormal behaviors for a WP multisite installation.
I would suggest that you make a backup of files and database, then re-install from scratch – clean wp-config.php, delete .htaccess file and drop database tables. I would suggest not using “Enable Multisite Plugin” and Create a Network manually. Get your feet wet already with the nitty gritty.
Read this BP Codex article – Before installing BuddyPress – specifically about double checking WP “wellness” before activating BuddyPress https://codex.buddypress.org/getting-started/before-installing/#wp-configuration for a less bumpy road to BP social site.