CPU high usage on one core

I started playing an mmorpg called Trickster Online. I noticed that sometimes, randomly, it would spike in usage on one of the cores of my CPU and stay that way. If I changed the affinity the usage would just skip over to the next core. I've noticed some other applications tend to stick to one core although a different one, like core #3 instead of #2. What is the cause of this?

Here's a screenshot:
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More about high usage core
  1. Is there a problem?
  2. Well I don't know if this is normal or not. Shouldn't the usage be spread out among all 4 cores instead of stuck mainly on one?
  3. Not if the program is single threaded.
  4. Alright, maybe it is. I couldn't find any information on the application about that though so I decided to ask here just to be sure. Thanks anyways!
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