Just tried a dummy booking on AC.com for mid Jan on AC962 and it shows J to Lima for $1600 via Bogota (PE is $1339) one way.

However, the aircraft is a 763; no PE.

If you try to select seats for either J or PE you get the exact same options, rows 1-8, A-F-K pods.

There are two connections same day and two the following day.
AC claims only 1 seat available for fastest connection.
Could this also be part of the problem perhaps.