Rambo assignment not registering

[GodAvokkrii]

Greetings.

I have killed 11 enemies without dying, with a sniper (not with a vehicle) and yet the Rambo assignment didn't register.

Here's the Battle Report of the round in question, if it helps: https://battlelog.battlefield.com/bf3/battlereport/show/1/92762907/916657949/

I'm also attaching a screenshot to serve as proof that I was 11/0: