If you're from the Philippines, then we have the same problem.
If your wifi's internet provider is Globe (like mine) then that's the reason why you're having problems with this website. I think it's because Globe has been actively blocking 'malicious' and 'illegal' sites from being accessed by their consumers.
My problem got resolved when I used a pocket wifi with smart sim. Your problem will also be solved if you have a Smart/TNT sim and use mobile data.

Please let me know when Mangago returns to normal