In the sources there is no 
returning f on the 7th quaver in bar 105. Similarly, in bar 107 Chopin overlooked a before f1. Those patent mistakes were undiscovered both by the revisers of the editions (in total 7 proofreadings in 3 editions) and by Chopin himself, who had to look at those places at least once, when, proofreading FE1, he added slurs embracing the discussed notes in both bars.
Compare the passage in the sources»
category imprint: Interpretations within context; Editorial revisions
issues: Omissions to cancel alteration, Errors of A, Errors repeated in GE, Errors repeated in FE, Errors repeated in EE
notation: Pitch