Placing the 
mark only next to the 2nd crotchet in the bar is probably an example of the Chopinesque manner of placing indications within, and not at the beginning of, their scope of validity. Nowadays, such notation is not used, hence in the main text we move the mark to the beginning of the bar, accordingly to the musical sense.
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources
issues: GE revisions, Centrally placed marks
notation: Verbal indications