The shorter ("triplet") slur in FE is the original version, changed by Chopin in GC (→GE) and – probably – in the base text to EE. Similar corrections of slurring were introduced by Chopin in GC also in bars 51 and 52. Not having an insight into the base text of EE, we cannot state whether leading the slur until the beginning of bar 51 in this edition corresponds to Chopin's notation.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Triplet slurs, Authentic corrections in GC
notation: Slurs