Here are the troubleshooting steps I've already carried out:
Device - The issue exists on both of my computers (desktop running Win 10 x64, laptop running WIn 10 x86), and my phone (iOS 9).
Browsers - The issue exists on every browser (latest versions of Chrome, Firefox, IE), and in incognito mode (with extensions disabled). On my phone, the issue exists with both Safari and Chrome.
ISP - The issue exists with two different ISPs accessible from my devices.
Location - I am located in Thailand. Someone in the US checked the site for me and confirmed that there were no such issues on that end. The Thai government does indeed blocks some offensive websites. But it's always with a big WARNING page, never like this.
Company - I emailed the company about the issue, but it's been two days with no reply. I don't expect a reply.
Apologies if this is the wrong forum for this; please direct me to the proper one.