I've posted many tickets about this issue but we've had 2/3 patches since and it's still not fixed.
Everything was OK before patch 5 where it suddenly stopped working.
If you have 2 or more guns of the same type. Lets say a Furious Handmade and a Instigating handmade and set each weapon as a separate favourite.
It works while you're in that session. If you reload or join another server the favourites merge into 1 block which means you have to rearrange them all again?!!
Infuriating if you have 4x handmades and 3x LMG's like me, all different prefixes. I spend 2 minutes just sorting out the favourites wheel when i join a new server or friends on another server.
Pleaseeeeeeee.