Hello, I had this same problem and this is how I fixed it. It was mentioned in this thread
(https://buddypress.org/support/topic/bad-link-to-profile-edit/)
that there may be a problem in the database table “wp_bp_xprofile_groups”. For some reason the first item id there is not “1” but something else. As you change the id to 1, everything works. Then it also shows the Profile details side Name field (required) in the registration page.
Also there was a problem to edit profile, it went to “Page not found”. This gets fixed also now, now you can edit the fields.
This seems to be some kind of bug in the installing process in some circumstances. I tested this by removing the BuddyPress and also deleting the BuddyPress database tables. They must be deleted manually, they wont get out by deleting the plugin.
New installation put the first id number to “3” to “wp_bp_xprofile_groups” table. Even the group_id in the table “wp_bp_xprofile_fields” was “1” (after I activated some components in BuddyPress menu, before that the tables were empty) for the first field item. So now the field item and the group item never matched.
Hopefully this helps someone. It seems that there are a lot of discussion of this problem, and this is a very annoying problem if you are really using BuddyPress.
Basically the registering had a workaround for example by using plugin “Theme my login”. The registering also looks simpler as there is not that “extra” name field. It is however unknown how BuddyPress works without that name field. Well, but perhaps that is an another story.
