the Rank Failure of Weapons in BFV

There is something wrong with my rank of weapons in BFV this day. Actually, not only guns but also vehicles couldn't upgrade at all. I clearly remembered that my rank of M1922 machine gun and M1935 automatic rifle were risen to the rank 10 and rank 2 after the game. Even my Valentine AT vehicle was risen from rank 0 to rank 2. However, none of my weapons's rank was upgraded as I had expected. I tried to restart my laptop but there's no use. The rank of my weapons is significant for me. Especially the machine gun M1922, ought to the max rank after my fierce battles today.