I logged into an official server after I had updated the game and found 7 .308 WIN rounds on the ground in a mili tent so I picked them up and went to combine them with my other .308 WIN rounds and they won't combine. Please note that one stack is not tracer and the other is not non-tracer they are both non-tracer and one is a stack of 9 and the other is a stack of 7 neither stack is ruined either. I've noticed that the tooltip at the bottom next to circle where it usually says "combine" now says "(hold) combine". My hypothesis is that it's a mistake on your guy's end after the update. I've also gone on a community server and split some pills and it won't let me combine them back together either so it's not just my game or the server as I've tried resetting my app and console to the result of the same issue/bug.