I bought them with certs and then equipped them on my first load out but now they don'teven appear for my second load out and not even in my first after i switched to anti tank mines.
Make sure you Resupply. Do not just fiddle with your loadout equips and expect them to be consistent, especially after just certing into something.
So, they are working, right? I remember it was bugged up to when the beta ended, where you had access to sticky mines, but couldn't find claymores.
They also seem to have a bug where you you can't see them in your loadouts while dead, respawning fixes it. Did you try to change your loadout after dying?