It looks like your ammo was doubled, and half was then removed. I've seen this happen before, where the server gives you your weapon loadout twice accidentally and then realises and removes half that you shouldn't have.
Weapon loadout saving/loading was completely redone a few updates ago (1.15.3, on July 3rd). So this might be fixed now. Regardless, where's your proof that it didn't just take your accidentally-duplicated ammo? Closing report because lack of detail and also probably fixed, and seems to be a non-issue anyway.