Greetings,
Thank you for bringing this up. After some checking, I was able to affirm my understanding of this issue.
x10hosting is a free host, and so many safe site checkers will look at it eerily because of that, whether or not it deserves it. If you look at this link and read the comments, you will see that x10hosting is not only safe, it is one of the safer free web hosts:
http://www.siteadvisor.com/sites/x10hosting.comNotice that the last comment states that it was confirmed as a phishing site. This is erroneous, as the site that he linked to never mentions x10hosting at all.
Thank you for bringing this up, and I hope that I answered your question sufficiently.