Question about Jack upgrades please

I’ve recently completed campaign on beginner and have upgraded Jack to the max. When I go to start a new campaign on expert using my old game save I lose all my jack upgrades from the beginning but have them towards the last acts. I thought once you earned all the components for jack he’d have all abilities available for you to use on a campaign difficultly of your choice. Or do you have to find all components again per difficulty?

You dont have to acquire them again (per my knowledge ateadt) but I have many times had to reapply them… Not sure why though…

Also may limit how many there are based on campaign progression (also not sure on this just a guess)