BuddyPress.org

Hi there, some things to check:

wp-content/plugins/bp-custom.php - general bp customisations
wp-content/themes/your-child-theme/functions.php - general wp customisations
wp-content/your-child-theme/buddypress/activity etc. bp page overloads

Those three files/locations are where most customisations will be done, but they could also be done via plugins so you should check what you have loaded as well.