https://bugs.openldap.org/show_bug.cgi?id=9893
--- Comment #8 from Howard Chu hyc@openldap.org --- (In reply to curtis.ruck+github from comment #7)
If i search with the given filter, it matches all the other users due to the (objectclass=inetorgperson) being in the OR filter.
I don't know why the unique overlay is generating filters like this, only after deleting a user.
Looks like your config is invalid. The URIs are missing a '/' and you probably should have only a single URI configured:
ldap:///?mail,uid?sub