In the campaign, i was initially having 40(in clip)-120(reserve). And of course, if I picked up Scarab, which uses the same ammo as SCAR, I could have a total of 320, or 40-280. Suddenly towards mid game, whenever I used or picked up a SCAR, I could only have 40 max ie. no reserve. If i had the high capacity drum magazine, I could have only 80 max with no reserve. What's happening? And to make things more confusing, my reserve ammo sometimes shows infinity, and sometimes negative. But they all mean zero. I can't reload after using up the first mag.