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How should I interpret this seemingly inconsistent output from top re: swap?

Seemingly inconsistent output from top

Running free confirms that no swap space is in use:

$ free -m
             total       used       free     shared    buffers     cached
Mem:         32098       4938      27159          0        216       1012
-/+ buffers/cache:       3709      28389
Swap:        15223          0      15223
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