It’s easy to get the magazine box pin in wrong if you happen to pull it apart so here are a couple things to check, especially if you replaced any of the parts…
When you push the follower down in the box it should move freely and not bind as it goes down so check it by hand.
If you pull it apart look at some of the following (I copied this from a different post)
In the end if it’s the right box, some guys will tune the spring by stretching it so it, compressing it or fixing where the spring it’s the bottom of the box.
It sounds like you have too much front pressure so the bottom of the spring could be too far forward…
1. If you don't have the assembly right, it won't feed right. Make certain you have the right box, follower and spring. Make sure the top of the box is pinched and seated into the receiver after you secure the little attachment screw.
2. Make sure you file the bottom of the mag box so it's completely clear from touching the bottom of the stock's blind mag floor. You don't want any binding and you don't want to accidentally push the box through the floor when you tighten the action screws.
3. Center and secure the bottom of the follower spring with two pieces of Gorilla tape. If the spring base isn't sitting right, the upward follower tension won't be even, causing misalignment/poor feeding.
