BuddyPress.org

When something like this happens, and it does a lot, I usually do this to discover the cause:

Disable child theme and go back to bp-default theme (disabling all theme fuctions.php in the process)

disable ALL plugins

remove all htaccess modifications

delete bp core files and reinstall (because sometimes I’m naughty and modify them)

disable bp-custom.php

Did you do all this?

You are using a child theme… right??