Minion Revive Speed Penalty?

I have the "Sacrifice" buff which states "Minions revive 37% more slowly" but the description reads "Minion revive speed penalty: 74%"

How should this be interpreted? Is it just actually 74% more slowly and the description is wrong? Should it read "Minion revive speed: 74%" because 37% is removed from the minion revive speed? If that's the case, shouldn't it be 63% revive speed since I have no other instances of more or less revive speed?