Before the bottom note of the 4th third in FE and EE there is no 
raising e1 to e
1. It indicates a possible Chopin's mistake in [A] (or an inaccuracy of notation). The sharp written in FC is perhaps an independent, yet undoubtedly correct addition of Fontana. Moreover, in EE there is no 
returning e1 in the next third, which can be an editorial revision, as the editor, believing that the previous note is correct, considered this sign to be superfluous.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Errors in FE, Errors in EE
notation: Pitch