There is a world of difference between bear cubs and yearling bears. The cubs are perpetual motion machines, constantly doing something except when they are asleep. Look at the ABR cubs in these photos.
In contrast to the busy cubs, the yearlings are much more subdued. They are solitary, and don’t seek each other out for companionship.
Amazing, isn’t it, how just a year can make such a difference in behavior. All the bears are behaving very normally for their ages.