That does not happen in my testing.
I added a bunch of them to a page to make it a long page and th eone at the bottom after scrolling to it does not go back tot he top when I click a tab.
Can you produce that problem on our demo site?
Only thing I can think of that would make that happen is if clicking the tab is doing a postback or if the user is editing it in such a way that it breaks the functionality somehow. The tabs use anchors and each anchor must be unique on a page, so maybe if they are adding more tabs or editing it in some way it is messing up the anchors.
Hope that helps,
Joe