It looks like you're using the old interpretation of ZAhO, namely
{za'o lo nu broda} -> {ca lo nu za'e broda}, but everyone on IRC these
days is using another interpretation, namely {broda za'o lo nu brode}
-> {za'o broda ca lo nu brode}, which has the advantage of not
implicitly modifying the contents of the tagged sumti (which no other
tags do).