Make sure that modules and page sets are added into plan correctly. Here is step-by-step procedure:
1. Log into Sitebuilder admin CP
2. Users -> Plans -> <PLAN_NAME>
Plan marked with color is the plan for trial sites.
3. If you wish to add modules into plan you should go into Modules tab. Select necessary modules (check them), click 'Add to Plan' button, click Ok to saved changes.
The same for 'Page Sets'.