Controller button preset not working?

I’ve always preferred Bf3’s button preset of B for melee and right stick for crouch, which is now alternate. However I noticed for some reason when I switch to that button presets, B will still crouch AS WELL, rendering me unable to use bipods or surface mounting. Is anyone else also experiencing this? I haven’t had enough free time to go through the controller mapping to manually set everything so I’m curious if this is an issue I’m exclusively dealing with or if it’s widespread, friend of mine who uses M&K said he couldn’t rebind his keys either.