I put a hologram and some other stuff on my SCAR and it worked in the next round. But then at the next round I had to unlock it again. And if I go into it from the main menu, my unlocks are used up and it is re-locked. Is this a bug?

This has happened to me, only I can still access my weapon attachments, but I have to reattach them every time I launch the game.

I think it has to do with playing on unranked servers.