Banners are region and language specific
When you put a game on a different region console it will try to show the banner for the current region and language, but if the data isnt in there for that region and language, it'll just be blank
In this case I guess the EU-English banner data for the US version of fire emblem has the 3d model with the swords, but not the 2d title logo
Try with other games, other games may behave differently. Like for example ocarina of time 3d US has the banner data for JP-jp despite not even being playable in japanese. I'm not sure if luma locale emulation will be able to force home menu to load the right banner but it's worth a try