Yes i think so, too. A wrong firm is loaded for other Region. I dont even know if there is a way to change the language otherwise of the luma menu.
If u boot the 3DS with holding select u get the luma config menu.
Maybe u enabled ( )Enable loading external FIRMs and modules, wich loads firms located in /luma/sysmodules and there is a spanish native.firm.
If u boot the 3DS with holding start you get the menu to load other tools and firms. Basicly there should only one and should be godemode9. If there is more then one firm located in /luma/payloads on the SDCard the chainloader starts and gives you a menu wich lists all the insert firms/tools.