on the last assignment I had 7/8 tank I destroyed 4 tanks two to getter and they where not recorded.
I think all of the assignments have a problem with recording kills. I have had a few where the ratio is about 4 kills for every one recorded. I did note that when carrying out a defend the base mission the recording appeared to be accurate.
Correct - the majority have been broken for some time now.
Same problem with Disabling the Tank not all was recorded took more than 15 tanks to get the mission, yet 5 tanks melee kills was fine. good game though notice they making it harder runner are coming into the house and tunnels and bunkers more, and the Hunters can come into the bunkers and houses more as well, even had seekers in the bunkers and houses.