Yes, they're both on the 5-65 last.
The Strand and McAllister may be immune due to the extra strip of leather around the ankle. The Park Avenue does not have this extra leather. Neither does the Fifth Avenue, but it's a less popular style so we may just hear less such reports.
That said, my Elgins have bowing, which either throws that hypothesis out the window or is inadmissible since they're factory seconds.