@pirap2: Same problem here, tabs are moving to the right if the current active tab is set to the left of the one I'm going to click, because after clicking it the currently active one will decrease its size, so everything moves to the left, and the new active tab has moved several positions to the right. I guess the number of positions it moves depends on the number of tabs you're using. If I click a new active tab that is to the left of the current one, it works correctly.