Firstly I’m an avast user not an avast team member.
The IP address in the alert isn’t for your domain (image1) and it is that IP address in the alert that is the issue. I don’t know if it might have something to do with the /~iieriewc/relay.xml page that it is going to, e.g. where does it relay to.
There are other domains on that data center that are or have been infected/suspect and it may be that which is causing avast to alert on the IP address, http://urlquery.net/report.php?id=203252.