Paulo wrote this in PT-1 comment:
In the early days of Postcrossing we didn’t track the original coordinates of origin/destination of a postcard, so when a person moved, the postcards “moved” with him/her.
We have fixed this a few years ago for new postcards, but for the older ones we don’t have a way to know the original coordinates (if the person moved in the meantime).
…except, of course, if it’s this one! I’ve manually updated it to reflect the original data. 1 km was more like it :).