It's being discussed in the opendns forum, opendns redirection is the culprit it appears.
"In order to resolve this, please log into the Dashboard and select Settings. After that, select your network, and then choose "Customization" in the left-hand menu. You will be brought to a page that you will allow you to toggle the "Enabled NX Domain Redirection" option. Please disable that option.
After that, flush your DNS resolver cache and web browser cache on each device to ensure that your new DNS configuration settings take effect immediately. Instructions to clear your DNS resolver cache can be found here: »www.opendns.com/support/article/68
, and instructions to clear your web browser cache can be found here: »www.opendns.com/support/article/67