Here in Mormon 2:27, the 1840 edition dropped the repeated their in this conjunctive noun phrase. This loss is very likely a typo and not the result of Joseph Smith’s editing for that edition. The 1908 RLDS edition restored the repeated their to the RLDS text. For further discussion of the tendency to omit (or sometimes add) repeated determiners in the text, see under conjunctive repetition in volume 3. Also see the discussion under 3 Nephi 9:2 for various examples involving abominations as a conjunct. abominations”; such repetition is characteristic of the Book of Mormon text.
Summary: Maintain the repeated their in Mormon 2:27, “because of their wickedness and their