From what I understand (I'm sure someone will correct me if I'm wrong) the older Marlins have an orange flat-faced follower in the magazine tube that doesn't jive well with the pointed, gummy tips of the Leverevolution rounds and this can cause feeding issues. There is a new red follower with a dimple in the face of it that allows the Hornady rounds to properly align and resolves the feeding and cycling issues.
A couple months ago, after having cycling issues with the Leverevolution rounds, I called Marlin to see about ordering one of the new followers. The customer service lady I spoke with was nice enough to send me a new follower at no cost. That told me that it was a common issue they were aware of and are offering a free fix. It might be worth it to call Marlin and see what they say, you never know, you might get a freebie. It was a fairly quick replacement. I'm not very mechanically savvy, but I was able to switch out the followers easily. No more feeding and cycling issues for me.
For what it's worth, I've mostly stopped shooting the Leverevolution rounds in my gun anyway in favor of the Remington 405 grains for factory ammo.