No, sorry - I forgot to put that in my post above. The carrier/lifter stays raised after loading rounds into the magazine. Benelli says it is supposed to move back to the lowered position when the gun is fired or pumped, but my lifter/carrier doesn't always lower like its supposed to, which should be why the shell in the magazine gets dropped out of the bottom of the receiver when I try to reload.
I guess I can just try to always remember to manually lower the carrier/lifter myself whenever I load the gun, but I didn't know if there's a common reason for why the carrier/lifter would be staying up.
Thanks!