There are three different writings there that relate to the heavenly witnesses.
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De rebaptismate (On Rebaptism)
De centesima, sexagesima, tricesima (On the Hundredfold, the Sixtyfold and the Thirtyfold Reward)
Ad Fortunatum de duplici martyrio (To Fortunatus on the Twofold Martyrdom), published by
Desiderius Erasmus in 1530 and probably also forged by him
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So when you see Ps-Cyprian in an apparatus, that is not very helpful.