I can see that.
What about these then:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Ok, I have tested on phone; Laptop; Desktop... so far the issue is found only using a desktop. I asked my brother to test from his desktop in firefox. He is unable to open in Firefox... so I'm thinking this may be a hosting provider issue.
I'll update when I figure it out.
Thank you again, Jason!