The problem here is the word "once" that was misplaced in Textus Receptus which became the source for King James Version of the Bible. In the original Greek text, this word was before the subject of the phrase, therefore giving a totally different meaning. The verse then should read:

"And as it is appointed, once men die, after this the judgment... " Hebrews 9:27

Naturally, the translators appointed to make the King James Version of the Bible in English in their turn transcribed and translated this errors to KJV -they use TR for their work, not the original texts in spite of what many incorrectly assume today-.

And this translator's error -not Paul's- continues to confuse and mislead many up to this very day.