The 
signs, highlighting the descending line of the tenor voice starting from a syncopation, were probably added by Chopin in GC and base text to EE (in this case it is hard to clearly state whether the signs in GC are written by Chopin). In analogous bars 71-72, a relevant sign is only in GC. The change of placement and range of the signs in GE2 (→GE3) was probably aimed at clarifying the notation.
Compare the passage in the sources »
category imprint: Differences between sources
issues: GE revisions
notation: Articulation, Accents, Hairpins