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It look like the tab is being initialised to a tab which isn't being rendered. We get this sometimess with forms which have different tabs showing depending on the type of record being viewed, e.g.|
User goes to a form for a record which has tab 1, 2 and 3, then selects the 2nd tab and leaves the form.
When they return to this form it's to view a record which doesn't require the 2nd tab, but the persistance cookie still says to show tab 2, so the script shows what you're seeing.
You'll have to manually set the tab to a visible one or something. Another thing you could do is switch off the persistance on that tab.