Well that's just confusing because according to what you said, in theory, it should be working for me, but it's not. I even tried inserting a background for the title screen to see if there was something wrong with the way inserted stuff, but nope that worked fine. Lol I'm so hopeless xD
BTW i noticed that you say graphic data not tileset. My assumption is that they're the same. Correct me if I'm wrong.