Why is my CPU at 100% when app usage doesn't total 100%?

Activity Monitor shows 0.00% idle CPU but app usage doesn't total 100%. Is there a way to see what else could be causing the CPU usage?

Thank you. I saved the file, opened it, and found this:
111    FahCore_a4                nobody     154.9    61.1 MB         2.43 GB   
Folding@Home is taking up the cycles in the background. I thought it was disabled when the controller app wasn't running.
Pausing the process dropped my usage to normal levels.

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