My understanding is that it's working correctly, because the icmp reply is sent back to 2.238.198.249 inside the tunnel and towards the amprnet router (169.228.66.251).
Unfortunately there's something wrong in the middle because no packets are actually reaching 2.238.198.249
It must be something in your 2.238.198.249 system or the path to it, because I can ping 44.134.160.1 without problem from other internet hosts.
Rob