The main opinion on the Net is that the wife wanted the photos taken down because the images of her were unflattering...and they were. Not because of Remembrance Day, it's clear both didn't have a problem with the observance from the photos.
Kim also makes it clear that Meghan and Harry are friends of their mother, Kris, not Kim nor Kloe.
https://www.dailymail.co.uk/tvshowbiz/article-15506543/Kim-Kardashian-Prince-Harry-Meghan-Markle-Instagram.html
118