I'm heading to Peru in September, and I'm on 3 LAN A319 flights as part of the trip. On all 3 flights, 5A/5L are available while other seats around it (the rest of row 5, rows 1-4, row 6/7 on 2 out of 3 flights, etc.) are all taken.

Is there a potentially negative reason 5A/L are always available, such as a lack of window or something that restricts legroom, that I should know about?

EDIT: All 3 seatmaps show the all-coach version of the 319.