Advance map. I'm gonna go check if it's only the maps I've modified or just all the maps in general.
Edit: it's happening with every map.
Well what map name byte thing are you using? cause afaik only show city names (0D) and do not show(00) are the only ones that work for me, and then it will base the map title image off of the map name. Cause I know show city names is the only one I have used and it will still show different map images.