BuddyPress.org

To make ‘Profile’ the default tag on a member’s page, put this in wp-config

define( 'BP_DEFAULT_COMPONENT', 'profile' );

Re ‘I fixed that issue by editing the bp-custom.php. ‘

We have no idea what you did or why.
If the Profile subnav is not showing up, then you have some other problems, probably theme related.
Change your theme to the WP 2012 and see if the problem exists.
If not, it’s your theme or custom code.