"Display site title and tagline" unchecked but it still appears on my header

Hello! I hope I get a quick response on this :D I am having trouble removing the site title and tagline on my header. I've put a logo on the theme so I wont be needing the site title and tagline. In the Appearance > Customize > Site Identity I have unchecked the Display site title and tagline already but it still appears in the header. Hope you can help, thanks! :) Brian