It is unclear whether according to Chopin diminuendo in these bars was supposed to be divided in two sections or not. In GC and CDP, bar 13 opens a new line of the text, hence it was most probably the same in [A]. In such a situation, two subsequent 
or 
signs were treated as equal to one, longer hairpins in Chopin's times. As two out of three sources based probably on [A] (GC and EE or FE) have divided signs and only one (CDP) – combined, in the main text we adopt the first notation.
However, most probably these bars, independently from the notation, are supposed to be embraced with one diminuendo wave, as it was unambiguously indicated in analogous bars 31-32.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Inaccuracies in GE, Scope of dynamic hairpins, Hairpins denoting continuation
notation: Articulation, Accents, Hairpins