I don't play a lot of tournaments myself, and I don't use the EV graph much either, so I can't really give you a full answer, but it does look as if you've been unlucky. You might want to switch to viewing the graph by BB instead of chips so that hands at the end of tournaments don't overwhelm everything else.
You can also use
Filters to isolate the all-in hands (Actions or Facing tabs) and look at what actually happened in the hands. You could use other filters to identify different types of situations to analyse separately.