First, I'd like to let you know that though it would this would look nice, this would take some toll in your page load speed.
Now to the issue, the most probable reason is the Lobster font is not loaded. The loading of font in X and Pro is by selecting the font in the Theme Options or in the builders. That is the optimized behavior because you will not want all of the fonts you've added in the Font Manger to load in the front-end because it will slow down your site.
If you have no text that will use the font in your site, you will need to load the font through third party means like what I recommended in this thread.
Hope that helps.