Mystic Forge - Rifle
I believe they fixed this in the last update: https://forum-en.gw2archive.eu/forum/info/news/Update-Notes-September-14th-2012
“A number of items created by using Mystic Coins are now correctly set to level 80.”
Unfortunately, that update came after your craft.
Yes, that came after my craft but it’s not my fault so AN should repair my rifle too.