sites showing as wrong site

Author: SCooper

Date: 2014-02-13
I have four sites which I admin on Objectis. One has disappeared due to running on older version of Plone. The other three when I put in the URL I get totally the wrong site show up, reloading often shows a different site and eventually the objectis site error page. There must be something going wrong in the DNS or the site generally has been hacked?
Hope can fix