A Google search brings up "perfectmoney.is" on top and the followed by "perfectmoney.com"
the search results must have something to do with your location or some previous searches. I just tested it on my computer, and .com came as the top result while .is I didn't find it in the top 5 pages of Google results.
perfectmoney.com is right for sure you can use it safely. nothing strange if a stronger service uses more domains in order to prevent phishing and impersonation. Check Chipmixer and their problem with fake websites impersonating them.