Notice that this chapter is numbered 28 in Hebrew and English, but in the Septuagint it is numbered 35. Jeremiah in the Septuagint is about 1/8 shorter than it is in the Masoretic text, and it is arranged rather differently. A table with the differences and omissions can be found here: https://www.ccel.org/bible/brenton/Jeremiah/appendix.html.