I haved embedded a map in a post on my user profile: https://www.worldanvil.com/author/Tillerz The 'legend' for this map is being pulled down to the bottom of the page by global, outside of the post.
It is not really surprising :) Maps probably are not a great idea on the posts :P I couldn't find the post including the map - which one is it?
It's the one posted on Sun, Jan 2nd 2022 06:08, if you scroll there, and then scroll down inside the post, you see the map that is EMPTY (not showing), but you see the bottom line below it.