The lines look like they are the product of a worn insert during the machining process. I am unsure of how they mill the titanium, as I've never worked that metal, but with aluminum and steel a pressed carbide insert is used and when it wears down(usually fine chips in the insert) you get an increased rough finish. It could also be a first run piece after a speed/feed adjustment, meaning they were probably running the shell mill(I'm guessing that's the tool they use) too fast horizontally for the spindle to keep up.
either way, if it bothers you then ask them to fix it. I know I would want at least a uniform finish, especially with a "cream of the crop" tool like a TTi. I wouldn't want to pay a premium price essentially FOR those scales only to have them not match.
On the other hand, it's a titanium encased TOOL. Its gonna get beat up anyway.
tons of help from me, huh?