Ive recently transferred a domain to a new registrar and pointed it to a new server in the A records. Some computers show the correct server but scarily some of them show the old one. I don't think its a browser caching problem as even computers that have never visited the site before show the old page.
I've checked the dns propagation using a few online checkers and they seem to show the correct ip.
What kind of things might cause this behaviour? and what might i be able to do to correct it?