I have noticed that the utilized time on the Planning Board page is way off. I can filter the tasks in the Tasks page by sprint and owner and everything looks good. But when I open the planning board for that sprint many of the users have a highly inflated utilized time.
We recently deleted a bunch of tasks that were previously a part of this sprint, so I suspected that those tasks were still being calculated. It seems my suspicion was correct as after purging those tasks from the database (via the Project History Changes) the utilized times seem to be correct now.