In the two mishnayos on this amud, Rashi first explains "bechol makom ba'azara" to mean "ein te'unin tzafon" and then, in the next mishna, as "af bedarom".
Why the difference?
Gershon
We have been unable to resolve this question. This question is asked by the Kodshei David, who also leaves it unanswered. We will keep it in our open file and get back to you, be'H.
Y. Shaw