Three crosses or One tree?

Tell me what do you see here? “the bodies should not remain upon the cross”? Look at the Greek text and tell me what you see with that same phrase. Either there are NOT 3 crosses as we are led to believe or the writer of the Gospel (who was not John) was not inspired by the Holy Spirit on that particular word.

John 19: 31 The Jews therefore, because it was the preparation, that the bodies (σώματα, bodies, N-Nominative Neuter PLURAL) should not remain upon the cross (σταυροῦ, cross, N-Genative Masculine SINGULAR) on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and that they might be taken away.

Either we have gotten it wrong or the Holy Spirit did. So who’s right and who’s wrong?