The last few times the I've used the L&L I've noticed the reservoir tube on the powder measure is loose. It's almost to the point of falling off when in use.
It’s a press fit. I made the mistake of picking up my measure, when it was about half full of powder, by the reservoir. It fell apart and made a mess. I cleaned it and put a little super glue on it before pressing the hopper back into place.
There is an aftermarket glass hopper that screws into place. I forget the brand name.
You may be able to screw/push it down a little further. It is fairly common.
You can probably get a new hopper out of Hornady if you call and talk to them.
I haven't done anything with mine, it's not loose enough to concern me. Dab of RTV would probably secure it without being permanent.