Marcos,
I just got into the admin area, but I wasn't able to determine what was preventing the bootstrap.min.js file from loading on the home page only. I tested disabling the RokSprocket modules, but saw the same problems. Did you ever narrow it specifically down to that module?
In general, I don't know your site well enough to understand what may be happening. When I switch to the Protostar template, the bootstrap.min.js file is properly included on the page. As long as you've made the edit I linked to above, the SCLogin module should be telling Joomla to insert that code on every page, including your home page, as well.
From here, I can only ask you to try to narrow things down for us. You know your site much better than we could. I don't know what modules are running on the home page, that may be conflicting. Please disable them (all of them) and see if the modal starts working. If not, try disabling any system plugins that are loading to see if one of those is interfering. I went through the RocketTheme template settings, but again, I don't know the template that well or how it should be configured. If you can narrow down a specific setting, or a lot of settings, that seem to be interacting on the home page to prevent our SCLogin module from working, that will help. Beyond that, I'm at a loss for what's causing the modal from working on that page.
I hope that gets you started, and I'd love to hear what you find.
Thanks,
Alex