In bars 21-26 the dynamic signs were not marked in AI. In bars 23-24, FE (→EE) has two separate signs, the second out of which (in bar 24) was, however, not included in GE, which can mean that Chopin added it in the last proofreading of FE. According to us, the melodically homogeneous context suggests that 
in bar 24 is to be understood as continuation of the previous one.
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category imprint: Interpretations within context; Differences between sources
issues: Errors in GE, GE revisions, EE inaccuracies, Hairpins denoting continuation
notation: Articulation, Accents, Hairpins