The bit in between the
<frameset></frameset> is your iframe. The fact that goulian.com/lockkill works fine on all devices (and uses the same theme), suggests that it is not the theme that’s the issue.
Are you using domain masking with GoDaddy? Because when I google that, there are lots of users noting that forwarding their domain causes it to lose responsiveness.
Even though Ben and others suggest that you should leave GoDaddy, I have had sites hosted on there that work fine. And while they wouldn’t be my first recommendation, it isn’t GoDaddy per se, it is that you are using one of their services that incorporates an iFrame, and that iFrame is causing your site to not work on mobile.
Can you not just create lockkill.com as an add-on domain and publish to it like you would any other site instead of using their domain forwarding?
(By the way, I don’t speak with any authority on hosting-related things, so don’t take the above as gospel or anything. Just putting 2 and 2 together.)