Problem with tikipedia theme behaviour

New Zealand

Tiki v20.0
Following an upgrade from v19, I'm re-building some elements of the site.
I have selected the Tikipedia theme in Look and Feel for both the site and admin - with all other parameters the default.
However, I am not getting the theme layout as that described and shown in
The theme is supposed to have a top panel and left side-panel

However, whenever I put a module in the Left module zone, they always display in a right-side panel !
What am I doing wrong ?