Once packet loss starts happening, then all following data is suspect. However, packet loss on the last hop means the packet loss is occurring on the return trip route back to your computer. It is a limitation of the Ping Plot/traceroute utilities. They can only show the path to the destination and not the return path.
The return path is a different path than the path data takes to the server. The only way for you to know where the real packet loss is, is for me to run a trace back to you.
As the first hop where the packet loss is occurring is at a gateway from your ISP to another ISP, you need to let your ISP know about the issue. Also note, this could be a simple matter of an over loaded router. Yesterdays news has everyone hopping in the Internet beating it up and it has definitely taken its toll on the infrastructure.