Note- Title was "Why do different Bible versions, KJV and WLC(Westminster Leningrad Codex), have a different number of chapters in Joel and Malachi?" I've changed it to ... Since then i've found that the WLC(Westminster Leningrad Codex aka WTT - Westminster Theological Text), is a digitized version of the BHS, and the BHS has chapters and verses. So the WLC got its chapter and verse divisions from the BHS.
Why do the KJV and BHS(Biblia Hebraica Stuttgartensia) have a different number of chapters in Joel and Malachi?
Which division came first(The KJV one, or the BHS one?), who changed it, and why?
I'm aware that chapter divisions were created around 1205 by Archbishop Stephen Langton.
How many chapters did he put in Joel and how many in Malachi?
When I look in bibleworks, I see that the KJV has 3 chapters in Joel and 4 in Malachi. And I see that the WLC (aka WTT), which is a digitized BHS, so, the BHS, has 4 chapters in Joel and 3 in Malachi.
I see that reflected also on websites. I'm aware that Jews adopted the Christian chapter divisions. A Jewish website http://www.mechon-mamre.org/p/pt/pt1401.htm has the format that the BHS uses of 4 in Joel and 3 in Malachi. Whereas a Christian website, has the format used by the KJV, of 3 in Joel and 4 in Malachi. So bibleworks and websites agree.
And it seems the difference is in Bible versions.
So I'm interested in what came first, whether it was A) 3 chapters in Joel, 4 chapters in Malachi, like the KJV. Or whether it was B) 4 chapters in Joel, 3 chapters in Malachi, like the BHS. And why was it changed?
curiousdanni has pointed out in comment, a line from wikipedia's page on the book of Malachi , that says "The book of Malachi is divided into three chapters in the Hebrew Bible and the Greek Septuagint and four chapters in the Latin Vulgate" Though since chapter divisions were created around 1205CE which is after all those books were produced, that line doesn't tell us which came first, who changed it and why.
According to this webpage, https://muse.jhu.edu/article/439032 which discusses old masoretic divisions(nothing to do with and not to be confused with, chapters and verses), and tries to draw similarities with christian chapters and verses, it happens to mention that Stephan Langton used the Vulgate. So that'd indicate that the Vulgate chapter divisions has the original ones that Langton or his Paris School Of Savants, came up with. I have then looked at the Vulgate online. And I see that it has 4 Chapters in Malachi, like the KJV.. which suggests that the BHS chapter divisions are a departure. I will update the question again accordingly to take this into account, as we now have a source for the KJV's chapter divisions. And we know it's the original one. Which just leaves the question of who came up with the variation and why.. whether it's the BHS authors that did.
In response to curiousdanni's comment bringing up about masoretic jewish divisions of the text.. Some of these websites that discuss the christian chapter divisions try to compare them to the masoretic jewish divisions, but i'm not talking about the masoretic jewish divisions. Note that the jewish masoretic divisions aren't called chapters, aren't numbered, and don't number verses, and even differ from christian chapters if looking at the first and second chapters of genesis, I'm talking of the jewish adoption of the christian chapter divisions. Where total chapters in each book are identical apart from that the number of chapters in joel and malachi are reversed!
And in response to curiousdanni's comment regarding the relationship between the WLC,BHS,and the LC.. I have found the relationship to be the following https://en.wikipedia.org/wiki/Leningrad_Codex "The Westminster Leningrad Codex is an online digital version of the Leningrad Codex....transcribed from BHS". (Therefore the source of the WLC is the BHS). As for the BHS https://en.wikipedia.org/wiki/Biblia_Hebraica_Stuttgartensia "The Biblia Hebraica Stuttgartensia, abbreviated as BHS or rarely BH4, is an edition of the Masoretic Text of the Hebrew Bible as preserved in the Leningrad Codex, and supplemented by masoretic and text-critical notes. It is the fourth edition in the Biblia Hebraica series started by Rudolf Kittel and is published by the Deutsche Bibelgesellschaft (German Bible Society) in Stuttgart....The Biblia Hebraica Stuttgartensia ...the editors have "accordingly refrained from removing obvious scribal errors" (these have then been noted in the critical apparatus)...[it] is meant to be an exact copy of the Masoretic Text as recorded in the Leningrad Codex.......exception to that is the Rafe diacritic.....One more difference to the Leningrad Codex is the book order, the Books of Chronicles have been moved to the end as it appears in common Hebrew bibles, even though it precedes Psalms in the codex...."
So, the BHS is the most accurate transcription made of the Leningrad Codex. Thet WLC is a digitized form of the BHS. I understand the BHS has chapter divisions.
This link analyzing chapter divisions between bible versions may be of interest http://catholic-resources.org/Bible/OT-Statistics-Compared.htm