BuddyPress.org

The “Action Event Firing Order” is an array that holds all action hooks that will be fired. Since your function data_to_add does not have a hook–i.e. it does not have a do_action( ‘data_to_add’); call–there will be nothing in that array. So, that is fine.

But, it does seem that the action event bp_activity_posted_update is firing your hooked to action function. The next step is to make sure that you are attaching to, hooking into, the proper action event hook. The hook bp_activity_posted_update passes three parameters, so hooking your custom function to it is not the best idea, unless you are trying to modify any of those three parameters. What exactly are you trying to accomplish?