I'm not 100% sure if this is the case, but I have seen templates that are "outside" the template override system that do not properly handle/address information that is presented in the uri because of not integrating with the index.php file. Again, not saying 12leaves doesn't properly integrate with the rest of ZC, but it does appear that implementation is outside the ZC standard design by not using the template override system. (This is based on the posted information, no additional research has been performed on this company or it's templates. It is also based on previous request to so integrate *A* template (unknown origin) into ZC to support all expected operation(s)).