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Animorph is correct -- the 20s you see is the duration of the debuff on the target, not the cooldown. Odds are that button is a purple color from 20 down to 10 then turns blue from 10 to 0... the purple color indicated the debuff is active on the target and on cooldown. The blue color indicates the debuff it active on the target but not on cooldown.
If it was only a cooldown but not active on the target, the color would be yellow (until the last ten seconds) or red (the last ten seconds).
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