Ubuntu redesigned their website, meaning Ask Ubuntu's top bar is out of date.
Note how the top bar "jumps" about:
Jumping around is probably inevitable: SE sites have fixed width 1100px, while Ubuntu site (which is now responsive) has width 984px at most. The recent widening of the SE sidebar has increased the difference.
One thing that could be done to improve consistency is to add Partners link to the SE version of the bar.