Weapon attachments not unlocking accordinglly

These past few days, some weapon level ups do not unlock their associated attachments right away. Like, I can level up a weapon 4 levels in 1 match, and maybe 2 of those levels will unlock attachments, or none at all. The attachments only unlock after I restart the game, so this hardware 2XP weekend I am having to restart my game after almost every match in order to get the attachments I should have unlocked.