Greek Texts in Accordance vs. KJV

Hello André-Philippe Therrien 

I asked me where do the “were gathered together at Jerusalem.” in the KJV come from. 

I see no Greek text in Accordance which supports it. https://accordancebible.com/link/research/[Alle_Texte];Griechisch_modern?ιερουσαλημ_[RANGE_Acts_4,6]

Interesting I found a lot in https://www.textusreceptusbibles.com/Interlinear/44004006 . Scrivener, Bezae, Stephanus, but none of these texts in Accordance have it. So they differs from this website.

My User Bible of the Oxford has it too.

Can you tell me more about these differences?

Because there are a list here https://www.textusreceptusbibles.com/Variations_Between_TR_and_KJV, but Acts 4:6 isn't listed. 

Thanks

Fabian