Jeremiah - Septuagint vs Masoretic
The clear distinction between the Septuagint and the Masoretic version of Jeremiah is problematic.
The Septuagint is commonly referred to as the Eqyptian version because it is thought that Egypt is where it was translated and the geographic separation with the Palestinian area could explain some of the textual differences with the Masoretic.
The Masoretic is sometimes referred to as the Babylonian version because it was developed by those who returned from Babylon.
In my view the Eqyptian, Septuagint, version of Jeremiah should be more authentic since Jeremiah went with the group that escaped to Eqypt. This group would have a more authoritative version of what Jeremiah wrote.