Image Intense does indeed style the Title 1 and Title 2 texts with different font weights. If you are not seeing that, it’s probably because you are using a font that does not respect font weight. For example, on our demo site the default header font is Gotham Ultra Regular, which does not have font weight variations.
In order to show the difference between Title 1 and Title 2 texts, we went with the ‘Open Sans’ font in all of the Image Intense modules on this page, which does distinguish font weight.