Tabs display as anchors and jquery code is not called from display page

Using Drupal 6.20, tabs 6.x-1.3, jQuery UI 6.x-1.4 and CCK Fieldgroup Tabs 6.x-1.2
I created a fieldgroup and set it up on a custom content type. The 2 groups are set up as "tabs" style in the form parameters AND in the field display screen.
It works fine on edit pages, where fields belonging to the tabs show as tabs, with the next buttons, and the like. But when I save the content and goes to the "display" mode, the 2 tabs show up as anchors, not as tabs.
the weird thing is that when I look to the page code, in the edit mode, scripts are being called:

While in the display page code, absolutely no script is being called!

Can anyone help?